Indoor Air Quality in Dubai Buildings: Limits, Tests and Fixes

Why indoor air quality matters so much in Dubai

Most people in Dubai spend almost all of their day indoors, in air-conditioned homes, offices, schools, malls and cars. Dubai Municipality's Technical Guidelines for Indoor Air Quality for Healthy Life make the same point: urban populations spend most of their time indoors, so the quality of the air inside buildings is an essential part of a healthy life. The guideline also notes that people are estimated to spend around 90 percent of their time indoors.

The climate makes the challenge harder. The guideline describes Dubai as hot and humid in summer and warm with rain in winter, with a highly built environment and energy conservation requirements that place special constraints on keeping indoor air acceptable. Buildings are sealed to keep heat out and cooling in, which saves energy but means that whatever is released inside, from paint and furniture to cooking, cleaning and people, stays inside unless ventilation and filtration remove it.

Poor indoor air does not always announce itself. Some effects appear quickly, such as headaches, eye and throat irritation, tiredness or difficulty concentrating, while others appear only after long or repeated exposure. The guideline is clear that for some pollutants there is no safe level of exposure, and that reactions vary greatly from person to person, so a building can feel fine to most occupants while still causing problems for the most sensitive.

This guide explains what the Dubai Municipality guideline sets out: which pollutants it covers, the limits for existing buildings, the comfort ranges, how indoor air is tested, how often air-conditioning systems should be cleaned and checked, and the practical steps owners, facility managers and residents can take. It is based on version 4 of the guideline, issued on 10 July 2024.

What the guideline covers and who it applies to

The guideline applies to the indoor environments of all kinds of public facilities, installations and buildings occupied by people, including regular users, clients and office employees. Its examples include hotels, residential buildings, office premises, shopping malls and education premises. It excludes places dedicated exclusively to industrial and medical sectors, such as factory workplaces and hospitals, and agricultural activities.

Its stated aim is to provide a uniform basis for protecting public health from the adverse effects of indoor exposure to air pollution, and to eliminate or reduce to a minimum exposure to pollutants that are known or likely to be hazardous. Dubai Municipality issues it as a tool to help establishments comply with relevant local regulations, and several of its provisions, such as the smoking rules, refer directly to Local Order No. 11 of 2003.

The guideline speaks to the people who control buildings. It states that the owner, management or representative of a building should identify indoor air quality problems in the premises, and that assessment of a problem is the responsibility of the building owner. In practice this means owners and facility managers carry the main duties, while tenants and residents are an important source of information about symptoms, odours and comfort.

Dubai Municipality has also published related documents that work alongside it, including a Technical Guideline for Mold Remediation and Control issued in May 2025 and an Environmental Indoor Air Quality Index issued in February 2025. Together they show the direction of travel: indoor air is treated as a public health matter, with measurement, records and accountability.

What good indoor air quality actually means

The guideline defines acceptable indoor air quality as air in which there are no known contaminants at harmful concentrations, as determined by the relevant authorities, and with which a substantial majority of the people exposed, 80 percent or more, do not express dissatisfaction. That definition has two parts: measurable contaminant levels and the experience of the people breathing the air.

It then aims higher, describing good indoor air quality as air with no known or expected contaminants at concentrations likely to be harmful, no conditions likely to be associated with health or comfort complaints, and air with which virtually no occupants express dissatisfaction. Good indoor air quality includes both pollution levels and the thermal environment: temperature, humidity and air movement.

This matters because many indoor air problems are not caused by a single dramatic pollutant. They come from the combination of several pollutants at low levels, warm or stuffy rooms, poor air distribution and odours. A building can pass a narrow test for one pollutant and still generate complaints, which is why the guideline treats comfort and contaminants together.

For owners, the practical lesson is that complaints are data. A pattern of headaches in one area, stuffiness in afternoon meetings or a musty smell after rain is often the first sign of a ventilation, moisture or maintenance problem that can be found and fixed.

The four factors behind most indoor air problems

The guideline explains that indoor air quality problems usually result from the interaction of four factors, all of which the owner, management or representative of the building should control. The first is sources: something inside the building, outdoors or within the mechanical systems releases contaminants or causes discomfort. If sources are not controlled, problems can arise even when the air-conditioning system is well designed and maintained.

The second factor is the heating, ventilation and air-conditioning system itself. A properly designed and functioning system should provide thermal comfort, distribute enough outdoor air to meet the ventilation needs of all occupants, and isolate and remove odours and contaminants through pressure control, filtration and exhaust fans. When filters are neglected, drain pans hold water or outdoor air dampers are closed, the system can spread problems instead of removing them.

The third factor is pathways and driving forces. Air moves from areas of higher pressure to lower pressure through any available opening, so contaminants can travel through stairwells, lift shafts, service risers, gaps around pipes and ducts, and from car parks into occupied floors. The guideline notes that the air-conditioning system is generally the main pathway and driving force for air movement in buildings.

The fourth factor is the occupants: how many people are in a space, what they are doing and for how long. People produce carbon dioxide, moisture and biological material, and activities such as cooking, cleaning and smoking add more. A room that was comfortable for four people can become stuffy for twelve, which is why changes in how a space is used should prompt a check of its ventilation.

Common indoor pollutants and where they come from

The guideline groups indoor pollutants into three broad types. Biological pollutants include bacteria, fungi, viruses, mould, pollen, animal hair and dander. Chemical pollutants include cleaners, solvents, fuels, adhesives, combustion by-products and emissions from furnishings and floor and wall coverings. Particles and aerosols include dust, smoke, mist and fumes from sources such as construction, printing, smoking and cooking.

Its source tables are a useful checklist for any Dubai home or office. Biological contaminants come from wet or damp materials, cooling coils and drain pans, damp duct insulation or filters, condensation and dust mites in upholstered furniture and carpets. Formaldehyde comes from particle board, plywood, cabinetry, furniture and fabrics. Volatile organic compounds come from paints, varnishes, solvents, adhesives, air fresheners, perfumes, printers and cleaning products.

Some everyday habits appear in the guideline's lists. Polycyclic aromatic hydrocarbons are linked to cooking and to incense and candle burning. Tobacco smoke, including shisha, is described as a major contributor to indoor air problems, containing several hundred toxic substances. Pesticides, including insecticides and disinfectants, are another source that depends heavily on how they are used.

Outdoor air is not automatically clean either. The guideline warns that ventilation assumes outdoor air is cleaner than indoor air, which is not always the case, and that traffic exhaust, neighbouring activities and dust can be drawn in through air intakes, windows and gaps. In Dubai, sand and dust events make filtration and the placement of fresh air intakes particularly important.

Sick building syndrome and building-related illness

The guideline distinguishes two types of building-associated health problems. Sick building syndrome describes situations where occupants experience acute health and comfort effects that appear linked to time spent in a building, but no specific illness or cause can be identified. Typical complaints include headache, eye, nose or throat irritation, dry cough, dry or itchy skin, dizziness, nausea, difficulty concentrating, fatigue and sensitivity to odours, with most people reporting relief soon after leaving the building.

The causes can be multiple: the combined effects of several pollutants at low concentrations, other environmental stressors such as overheating, poor lighting or noise, ergonomic problems, psychosocial stress, or factors that are never fully identified. That is why investigations look at the whole environment, not only at air samples.

Building-related illness is different. It describes diagnosable illnesses that can be attributed directly to airborne building contaminants, such as certain allergies or infections. The guideline gives Legionnaires' disease and hypersensitivity pneumonitis as examples, notes that symptoms can include cough, chest tightness, fever, chills and muscle aches, and that recovery can take longer after leaving the building.

For building managers, the difference shapes the response. Sick building syndrome complaints call for a structured investigation of ventilation, sources and comfort. A suspected building-related illness calls for urgent action, medical advice for those affected, and a specialist investigation of the systems most likely to be involved.

The limits Dubai sets for existing buildings

The guideline sets maximum limits for common air pollutants in existing buildings, measured mainly as eight-hour averages. Total volatile organic compounds should not exceed 0.6 milligrams per cubic metre over eight hours. Formaldehyde should not exceed 0.01 parts per million over eight hours, with a short-term limit of 0.08 parts per million over 30 minutes. Carbon dioxide should not exceed 800 parts per million over eight hours, and the table also gives a short-term reference of 700 parts per million above outdoor levels.

For carbon monoxide, the eight-hour limit is 9 parts per million and the one-hour limit is 25 parts per million. For particles, the 24-hour limit for fine particles, PM2.5, is 35 micrograms per cubic metre, and for PM10 it is 150 micrograms per cubic metre. For biological contaminants, the total bacterial count should not exceed 1,000 colony-forming units per cubic metre and the total fungal count should not exceed 500 per cubic metre.

New buildings have a separate table that is stricter in places. Before occupancy, total volatile organic compounds should not exceed 300 micrograms per cubic metre over eight hours, and both bacterial and fungal counts should not exceed 500 colony-forming units per cubic metre. Buildings that optionally carry out this testing before occupancy and meet the limits can be awarded an indoor air quality certificate by Dubai Municipality.

Carbon dioxide deserves special mention because it is easy to measure and very revealing. The guideline describes measuring carbon dioxide as one of the most practical investigative tools for checking whether occupied spaces are adequately ventilated. High readings in a meeting room or classroom do not mean carbon dioxide itself is the main hazard; they mean the room is not getting enough fresh air for the number of people in it.

Comfort ranges: temperature, humidity and air movement

Indoor air quality is not only about pollutants. The guideline requires that, for all new and existing buildings, the air-conditioning system should be capable of providing a set range of conditions for 95 percent of the year. The recommended dry bulb air temperature range is 22.5 to 25.5 degrees Celsius, based on the comfort of 80 percent of occupants.

The recommended relative humidity range is 20 to 60 percent. The guideline adds limits on combinations of temperature and humidity, and its moisture management advice goes further: keep relative humidity below 60 percent, and below 50 percent where feasible to control dust mites. Humidity is one of the most important factors in Dubai, because humid air reaching cool surfaces condenses, and damp materials support mould and dust mites.

Air movement should be within 0.2 to 0.3 metres per second. Too little movement leaves rooms feeling stuffy and allows stagnant pockets; too much creates draughts and complaints. The walkthrough checklist in the guideline also asks inspectors to check that the temperature difference from floor to ceiling does not exceed 3 degrees Celsius, and that diffusers, partitions, stored files or furniture are not blocking air circulation.

These ranges give owners a simple way to judge complaints. A room at 27 degrees with high humidity is outside the recommended range regardless of how the thermostat is set, and the cause may be an undersized unit, a dirty coil, a blocked return, an occupancy change or a control problem.

How indoor air is tested in Dubai

The guideline sets out how measurements should be taken so that results are meaningful. The sampling probe should be placed between 150 and 200 centimetres from walls and between 100 and 200 centimetres above the floor, at the centre of the room or occupied zone. It should not be directly in front of supply diffusers, fans or heaters, not in the operator's exhaled breath, not in direct sunlight, not within 3.5 metres of a lift or entrance in a corridor or lobby, and 3 metres from doors.

Measurements should normally be made over eight hours. Where continuous eight-hour measurement is not practical, the guideline accepts an average of half-hour measurements taken in four time slots spread over business hours, chosen to cover the worst case in public places, such as the busiest periods. Rooms that are totally enclosed and not served by the air-conditioning system, such as store rooms, plant rooms and restaurant kitchens, are not measured.

The number of sampling points depends on the area served by the air-conditioning system. At least one sample should be taken from each floor or each area served by a separate air handling unit. For buildings under 3,000 square metres, the guideline asks for one point per 500 square metres, rising in steps to 21 points for buildings of 20,000 to 30,000 square metres, and one point per 1,200 square metres above 30,000 square metres. At least two outdoor samples should be taken at the building entrance or the fresh air intake for comparison.

Testing for compliance must be carried out by a company or laboratory accredited by the Emirates International Accreditation Centre, and compliant results must be submitted to Dubai Municipality. Testing equipment must have initial and periodic calibration certificates, at least annually, kept in a register that Dubai Municipality can check. Quality control also includes field blanks and duplicate samples for at least one sample or 10 percent of samples, whichever is larger.

When volatile organic compound results fail

Total volatile organic compounds are a common cause of failed results, especially after painting, new furniture or a fit-out. The guideline provides a second route for these cases. If the total reading at a sampling point exceeds the limit, ten common individual compounds can be measured at that point using recognised methods, and if all ten meet their individual limits, the point is treated as passing for total volatile organic compounds.

The individual compounds listed include benzene, naphthalene, trichloroethylene, tetrachloroethylene, toluene, xylene, styrene and two dichlorobenzenes, each with its own eight-hour objective. Benzene, for example, has an objective of 17 micrograms per cubic metre. Identifying which compounds are elevated also helps find the source, because the guideline's source tables link each one to typical materials and activities.

Where results do not comply, the guideline asks the owners or management, with the assistance of a competent accredited investigator, to carry out remedial actions in the non-compliant areas. The investigator may then re-measure the failed parameters after the remedial work. In practice, remedial action usually means removing or reducing the source, increasing ventilation, improving filtration and allowing time for new materials to off-gas.

For owners planning a fit-out, the cheapest approach is prevention: choosing low-emission paints, adhesives and furniture, scheduling work when spaces are empty, ventilating heavily during and after the work, and testing before staff or residents move in rather than after complaints start.

How often air-conditioning systems should be checked and cleaned

The guideline gives maintenance intervals for air-conditioning systems because so many indoor air problems begin there. The building and its air-conditioning system should be inspected at least every three months, or seasonally as needed, for functions significant to indoor air quality. The maintenance schedule should follow the manufacturer's recommendations so that equipment operates efficiently.

Specific components have their own intervals. Fans and dampers in air handling units should be cleaned at least every six months, depending on the incoming air and how the system is used. Cooling coils and condensate pipes should be cleaned at least every six months, and drain trays at least every month and more often if their condition requires it. Filters should be cleaned or replaced so that they perform properly at all times and do not become clogged.

The guideline also asks that the system be checked and adjusted for correct airflow, temperature and humidity after its first year of operation and at least every year after that, and after any renovation or change in floor layout that could affect air distribution. After a major renovation that affects the system, such as new partitions, the air distribution should be rebalanced.

Filtration has its own requirements. The minimum arrestance efficiency for filters cleaning outdoor air is given as 60 percent and for indoor air as 80 percent, and it should be possible to check the condition of a filter, including its pressure drop, at any time. Filters must fit properly, with a good seal to the surrounding duct or unit, so that air does not bypass them.

Drain pans, coils and ducts: where mould starts

The guideline explains that dirt in ventilation systems combined with poor management of water can lead to biological growth in the airstream and serious indoor air problems. These conditions usually come from inadequate particle filtration, poor filter maintenance and problems with cooling coil condensate. In Dubai, where air conditioning removes large amounts of moisture from the air, the drain pan under each coil is one of the most important places to keep clean.

Drain pans should be clean, properly drained and free of visible mould, and the drain connection should be at the very bottom of the pan so that water does not stand. The guideline also warns about moisture carryover: if air moves too fast across part of a coil, for example because of localised dirt, water droplets can be blown onto downstream surfaces and wet the duct.

Duct linings deserve attention too. The guideline notes that liners with fibrous or rough surfaces can support mould growth, because dirt accumulates, holds moisture and provides nutrients, and mould that grows into fibrous material is hard to remove. It recommends that supply and return ducts be accessible for inspection and cleaning, and that inner surfaces be smooth and resistant to abrasion.

A practical sign of trouble is visible in the room itself: dirt marks or white dust on diffusers, a musty smell when the AC starts, or water stains around ceiling units. The guideline's walkthrough checklist includes these signs, and they usually point to filters, coils, drain pans or duct sections that need cleaning.

Moisture, humidity and the link to mould

The guideline's moisture management protocol starts with a simple principle: the key to controlling mould is controlling moisture and relative humidity. It lists practical steps: keep relative humidity below 60 percent and below 50 percent where feasible, keep all parts of the building dry that are not designed to be wet, insulate exterior walls and ceilings to avoid condensation, and insulate cold water pipes so they do not sweat.

It also sets a clear timeline for spills: clean them immediately, and thoroughly clean and dry liquid spills on porous surfaces such as carpet within 24 hours or discard the material. Furniture, carpet and similar porous materials that have been wet for more than 24 hours, or that have a persistent musty odour, should be discarded, as should ceiling tiles with visible water stains.

Areas that are designed to be wet, such as showers, need regular cleaning, enough exhaust to remove steam, and floors and walls washed often where water accumulates. Drain pans should be cleaned often and sloped to drain. Water should never be allowed to stand anywhere in the building, and drainage around the building's perimeter should be maintained.

Where mould has already grown, Dubai Municipality's separate Technical Guideline for Mold Remediation and Control applies. It classifies affected areas by size, describes containment and cleaning methods, and sets verification steps, including moisture content in wood and drywall below 16 percent and relative humidity below 60 percent in the affected area after remediation.

New buildings, fit-outs and the flush-out period

Emissions from building materials and interior finishes are typically at their highest when a building or fit-out is completed. The guideline therefore recommends operating the air-conditioning system at a higher than normal ventilation rate for a period before occupancy and during initial occupancy to flush out contaminants, and delaying occupancy until a reasonable flush-out has been completed.

It also describes ways to limit the impact of unavoidable emissions, such as emission barriers, conditioning materials before installation, curing in place, delayed occupancy and short-term gas-phase air cleaning. Material selection is the starting point: the guideline asks that building materials and surface finishes should not emit chemicals, bacteria or fungi, and that low-emitting materials be chosen based on sound technical consideration.

During construction, inspections by competent persons should take place at all stages so that acceptable indoor air quality can be achieved when the system starts. After the air-conditioning system begins operating, the guideline recommends an audit by accredited competent persons within six months, covering the entire building rather than only areas with complaints.

For tenants moving into a newly fitted office or apartment, a sensible step is to ask whether a flush-out was carried out, whether any indoor air testing was done before handover, and what paints, adhesives and furniture were used. These questions are easier to answer before move-in than after complaints start.

Renovation and painting without spoiling the air

Renovation is one of the most common causes of indoor air complaints in occupied buildings. The guideline asks that major renovation be carried out so that a satisfactory indoor environment is maintained, that processes with the lowest possible emissions be chosen, and that polluting activities be enclosed, provided with local extraction, carried out in areas exhausted directly outside, or limited to times when few people are present.

For partly occupied buildings, spaces under renovation should be isolated from occupied zones, and supply air separated if necessary so that occupants keep acceptable air. Concentrations of formaldehyde, volatile organic compounds and particles in occupied rooms should stay within the guideline's limits during the work.

The painting protocol is specific: establish a protocol and make sure both in-house staff and contractors follow it, use low-emission and fast-drying paints where feasible, paint during unoccupied hours, keep lids on containers, ventilate with significant quantities of outdoor air during and after painting, flush the building before occupancy, continue higher ventilation for some time afterwards, and avoid spraying where possible.

After any renovation that changes the layout, such as new partitions or a different floor arrangement, the air distribution should be rebalanced. A room created by a new partition may have no supply or return air at all, which is one of the most common causes of stuffy offices after a fit-out.

Enclosed car parks and carbon monoxide

Many Dubai buildings have basement or podium car parks connected to lobbies, lifts and stairwells. The guideline sets specific rules for enclosed parking. Mechanical ventilation must keep carbon monoxide in the parking area below 50 parts per million, either by providing at least six outdoor air changes per hour or by using a variable volume system controlled by sensors.

Carbon monoxide monitoring is required with at least one sensor per 400 square metres of parking floor area, and an alarm should sound when the concentration reaches or exceeds 75 parts per million in at least 5 percent of the monitored locations. Where a building management system is installed, carbon monoxide should be monitored in real time. Each parking level must receive outdoor air, and ventilation must be capable of ten air changes per hour for smoke clearance in a fire.

Occupied areas connected to enclosed parking, such as offices, shops, hotels and waiting areas, must be supplied with conditioned air under positive pressure compared with the parking area, so that exhaust fumes do not flow into them. The walkthrough checklist also asks whether stairways, lift shafts and ducts are acting as pathways for vehicle exhaust.

Sensors drift over time, so the guideline requires carbon monoxide monitoring equipment to be checked and recalibrated every six months, or according to the manufacturer, by a specialised calibration company certified by Dubai Municipality. Test results and calibration certificates must be kept on site and be available for inspection.

Smoking, pest control and other activities

The guideline states that smoking is strictly prohibited in public places in accordance with Local Order No. 11 of 2003, including shopping centres, hotels, restaurants, government buildings, healthcare facilities, commercial buildings, common accommodation and coffee shops, except where smoking is permitted under Dubai Municipality's rules. Designated smoking areas must be at least 25 feet, about 7.6 metres, from building entrances, doors, operable windows and outdoor air intakes, and permitted smoking places require an annual permit from the Health and Safety Department.

Pest control is another activity with a direct effect on indoor air. The guideline recommends integrated pest management to minimise pesticide use: controlling dirt, moisture, clutter, food and entry points; using baits and traps rather than sprays where possible; avoiding routine preventive spraying; applying pesticides only where pests are found and only during unoccupied hours; ventilating with outdoor air during and after application; and notifying occupants beforehand.

Cleaning products and activities matter as well. The guideline asks buildings to choose easily cleaned materials, store and handle cleaning products properly, include cleaning protocols in operation and maintenance documents, and schedule activities that produce emissions for unoccupied periods where possible.

Loading docks and deliveries can also bring fumes inside. The guideline recommends preventing vehicle idling at loading docks, keeping receiving areas under positive pressure relative to outside, and periodically checking that these arrangements work.

Practical steps for homes and apartments

Although the guideline is written mainly for public facilities and buildings, its principles translate directly into home habits. Keep AC filters clean and replace them as the manufacturer recommends, and have the indoor coils and drain pans cleaned regularly so that water does not stand and grow mould. If the AC smells musty when it starts, or if there are water stains around a ceiling unit, arrange a service rather than masking the smell.

Control humidity. The guideline's advice is to keep relative humidity below 60 percent and below 50 percent where feasible. A simple hygrometer shows whether a room is within range. Run kitchen and bathroom extract fans during and after cooking and showering, dry spills on carpets quickly, and investigate any damp patch, stain or musty smell, because these are early signs of moisture problems.

Reduce sources. New furniture, paint, varnish and some cleaning products release chemicals, especially in the first weeks. Ventilate well after painting or when new furniture arrives, choose low-emission products where possible, and store chemicals in closed containers. The guideline lists incense and candle burning, tobacco smoke including shisha, and air fresheners among indoor sources, so limiting them indoors improves the air noticeably.

Finally, consider a simple monitor. Consumer devices that measure carbon dioxide, humidity and particles are not substitutes for accredited testing, but they show patterns: a bedroom that reaches high carbon dioxide levels overnight with the door closed, or a living room where particles spike during cooking. Those patterns point to practical fixes such as better ventilation, extract fans or filtration.

Practical steps for offices and building managers

For offices and managed buildings, the guideline's action plan begins with documents: up-to-date as-built drawings showing air-conditioning equipment, a list of control set points and ranges, manufacturers' operating and maintenance instructions, maintenance records and a log of air quality and comfort complaints. Without these, investigations rely on guesswork.

Next comes a whole-building walkthrough by competent persons, using a checklist such as the one in the guideline's appendix. It covers odours, dirt and dust, visible mould, staining, drain pans, ventilation and exhaust, blocked vents, uneven temperature, overcrowding, filter condition, chemical storage in plant rooms, outdoor air intake locations, damper operation and whether the system is switched off at any time during the day.

Occupant feedback is part of the method. The guideline includes a sample confidential questionnaire covering symptoms, timing, location and any observations about temperature, humidity, draughts, stagnant air or odours. Patterns in timing and location often lead directly to a cause, such as a meeting room that becomes stuffy in the afternoon or a floor near a car park entrance.

Finally, the guideline asks owners to keep a formal record book for the air-conditioning system, including a description of the system, the name of the building manager responsible for records, the person or company responsible for risk assessment and precautions, the maintenance company, and the dates and details of inspections, cleaning and remedial work. During normal operation, an audit by accredited competent persons should be carried out at least every two years.

Investigating a complaint step by step

The guideline includes a simple diagnostic flow that any building can follow. A competent person starts with an initial walkthrough: preparing, inspecting visually and talking with occupants and staff. If the walkthrough explains the complaint, a control strategy is tried straight away. If it does not, more information is collected about the occupants, the air-conditioning system, the pathways air can take and the possible sources, with sampling only if it is needed.

From that information, the investigator develops one or more explanations and tests them, either by changing building conditions, such as increasing outdoor air or isolating a source, or by carrying out appropriate measurements. If the results support the explanation, a control strategy is applied and then validated with a follow-up check. If the problem is solved, the final step is to make changes so that it does not recur.

The guideline stresses that sampling is not necessarily the best or first approach, that simple solutions should be prioritised when they are effective, and that many indoor air problems have more than one cause and may need several corrective actions. It also recognises the limits of any single practitioner, recommending that HVAC engineers, medical professionals or other specialists be involved when the problem requires them.

Clear communication runs through the whole process. Occupants should be told what is being investigated, what has been found, what is still uncertain and what will be done, because a well-explained investigation reduces anxiety and helps people report symptoms accurately.

Smart monitoring and Dubai's indoor air quality index

Many newer Dubai buildings now include sensors that measure carbon dioxide, particles, temperature and humidity and report them to a building management system. Dubai Municipality's Environmental Indoor Air Quality Index, issued in February 2025, provides a descriptive scale for indoor air quality and applies to buildings and facilities in Dubai, especially those equipped with smart or internet-connected monitoring systems, excluding specialised medical facilities.

Continuous monitoring has clear advantages. It shows how air quality changes through the day and with occupancy, highlights rooms that drift out of range, and lets facility teams respond before complaints arrive. It also creates a record that supports maintenance decisions, such as when filters are loading up or when a floor needs more fresh air.

Sensors still need care. The guideline's quality control section asks that real-time monitors be checked before use, allowed to reach steady state, and calibrated according to the manufacturer's specifications, with records kept of their identification, calibration, maintenance and any repairs. A sensor that has drifted can be worse than none, because it gives false reassurance.

Continuous monitoring complements, but does not replace, the accredited testing the guideline requires for compliance. It is best used as an early-warning system that tells the building when to clean, adjust or investigate.

A simple indoor air quality calendar

Monthly: clean or check AC drain trays, check filters and replace or clean them as needed, look for water stains, musty odours or dust marks around diffusers, and review complaint logs for patterns. In homes, a monthly look at filters and drain points prevents most odour and mould problems.

Every three months: inspect the building and its air-conditioning system for functions that affect indoor air quality, as the guideline recommends at least every three months or seasonally. Check humidity levels in representative rooms, confirm outdoor air dampers and exhaust fans are working, and confirm that partitions, furniture or stored items are not blocking air circulation.

Every six months: clean air handling unit fans and dampers, cooling coils and condensate pipes, and review whether ducts need inspection or cleaning based on their condition. In enclosed car parks, recalibrate carbon monoxide sensors through a Dubai Municipality certified calibration company.

Every year and every two years: check and adjust airflow, temperature and humidity each year and after any layout change, and carry out an indoor air quality audit by accredited competent persons at least every two years during normal operation, with any required testing done by an accredited laboratory.

How Power Zone Dubai supports cleaner indoor air

Power Zone Dubai provides AC maintenance, duct cleaning, deep cleaning, mould remediation and building maintenance from its office in Business Bay, across all seven emirates, with 20 in-house teams. For homes and buildings, much of the indoor air quality work described in this guide is maintenance work: clean filters, coils, drain pans and ducts, controlled humidity, dry materials and well-planned renovations.

Where compliance testing is needed, it must be carried out by a laboratory accredited by the Emirates International Accreditation Centre, as the guideline requires. Maintenance teams and laboratories work best together: the laboratory measures, and the maintenance team finds and fixes the sources and system problems behind the results.

Owners and facility managers can request a quotation through the Dubai prices page or by contacting the Dubai office on WhatsApp. A useful first step is to share the building type, the areas with complaints, the age of the AC system and any recent renovation, so that the visit focuses on the most likely causes.

Frequently asked questions

What is the CO2 limit for indoor air in Dubai buildings?

Dubai Municipality's Technical Guidelines for Indoor Air Quality set a carbon dioxide limit of 800 parts per million as an eight-hour average for existing buildings. High carbon dioxide usually means a space is not receiving enough fresh air for the number of people in it.

What temperature and humidity does the Dubai guideline recommend?

The guideline recommends a dry bulb air temperature of 22.5 to 25.5 degrees Celsius and relative humidity of 20 to 60 percent, with air movement of 0.2 to 0.3 metres per second, achievable for 95 percent of the year. Its moisture advice is to keep humidity below 60 percent and below 50 percent where feasible.

How often should AC coils and drain pans be cleaned?

The guideline says cooling coils and condensate pipes should be cleaned at least every six months and drain trays at least every month, more often if their condition requires it. Fans and dampers in air handling units should be cleaned at least every six months.

Who can carry out an indoor air quality test in Dubai?

Compliance testing must be carried out by a company or laboratory accredited by the Emirates International Accreditation Centre, with calibrated equipment, and compliant results must be submitted to Dubai Municipality.

How often should a building's indoor air quality be audited?

The guideline recommends an audit by accredited competent persons within six months after an air-conditioning system starts operating, and at least every two years during normal operation. The building and its AC system should be inspected at least every three months.

What are the most common sources of indoor air pollution at home?

The guideline's source tables include damp materials and dirty AC drain pans, dust mites in carpets and upholstery, formaldehyde from pressed-wood furniture, volatile compounds from paints, cleaners and air fresheners, cooking, incense and candles, and tobacco smoke including shisha.

What should happen after painting or a fit-out?

The guideline recommends low-emission products, painting during unoccupied hours, heavy ventilation with outdoor air during and after the work, a flush-out before occupancy, and rebalancing air distribution after any layout change.

Do enclosed car parks in Dubai need carbon monoxide sensors?

Yes. The guideline requires ventilation that keeps carbon monoxide below 50 parts per million, at least one sensor per 400 square metres of parking, an alarm at 75 parts per million in at least 5 percent of monitored locations, and recalibration every six months by a Dubai Municipality certified company.

Reference sources

Next step

Read the main service guide · Related service guide · Request a Dubai quotation.