Existing buildings in Dubai are addressed by a different clause, and a different kind of clause, from the one that governs new construction. Clause 9-8-4 of Dubai Municipality's Technical Guidelines for Indoor Air Quality for Healthy Life, reference DM-HSD-GU119-IAQ, Version 4, issued 11 December 2024 by the Health and Safety Department, states that indoor air testing for the contaminants in Table 2 must be carried out. Unlike the clause that precedes it, it contains no optional qualifier and offers no certificate in exchange for compliance. The distinction is structural rather than stylistic: the guideline houses a voluntary certification route and a testing requirement inside the same document, and secondary summaries frequently collapse the two into a single description that is wrong in both directions. This page sets out the clause 9-8-4 duty, the Table 2 parameters and the averaging periods that give those parameters meaning.
Clause 9-8-4 covers existing buildings and states that indoor air testing for the contaminants in Table 2 must be carried out. There is no conditional phrasing in the clause, no threshold of size or occupancy that switches the duty on, and no election available to the owner. The clause is written as a requirement rather than as an inducement.
That wording is the reason the guideline cannot accurately be described as voluntary as a whole. The document contains both characters at once, and the clause that reaches a particular building depends on whether that building is new or existing for the purposes of the guideline.
Clause 9-8-4 sits within the general scope of the guideline, which excludes premises exclusively dedicated to industrial and medical sectors, for example hospitals and factories. A building falling inside that exclusion is outside the reach of the clause, and its indoor environment is addressed, if at all, by other instruments.
Clause 9-8-3 covers new buildings and states that buildings which optionally apply the procedures will be awarded an indoor air quality certificate by Dubai Municipality. The word optionally defines the character of the route: the Table 1 limits are the entry conditions attached to a voluntary application rather than thresholds imposed on all new construction, and the reward for meeting them is an award by the Municipality.
Clause 9-8-4 reverses both halves of that structure. The testing is required rather than elected, and the clause describes no certificate as its outcome. The duty is discharged by carrying out the testing against Table 2, not by obtaining an award, and no validity period or retest interval is published for the Dubai Municipality certificate in any event.
The two clauses also carry different tables, and the tables are not interchangeable. Applying Table 1 values to an existing building, or Table 2 values to a certificate application for a new building, produces an assessment against the wrong instrument even though both tables sit inside the same document and share several contaminants.
Table 2 applies to existing buildings under clause 9-8-4. It sets TVOC at 0.6 mg/m3 over 8 hours, formaldehyde at 0.01 ppm over 8 hours as the long-term value together with 0.08 ppm, equal to 0.1 mg/m3, over 30 minutes as the short-term value, carbon dioxide at 800 ppm over 8 hours, carbon monoxide at 9 ppm over 8 hours, and ozone at 0.06 ppm over 8 hours.
Each of those figures is meaningless without the period attached to it. A carbon dioxide reading of 800 ppm captured as an instantaneous spot value is not the same measurement as 800 ppm over 8 hours, and a formaldehyde figure quoted without its basis cannot be assigned to either of the two entries the table provides for that contaminant.
Table 2 is more lenient than Table 1 on TVOC. Table 1, which applies to new buildings under clause 9-8-3, sets TVOC at 300 micrograms per cubic metre over 8 hours; Table 2 sets 0.6 mg/m3 over the same 8-hour period, which is twice as lenient. The formaldehyde entries are identical across the two tables. Carbon dioxide, carbon monoxide and ozone appear in Table 2 with the values above.
The chemistry of these substances, their indoor sources and their health effects are the subject of separate references and are not restated here; this page addresses only what the tables require and on what basis.
Formaldehyde is the contaminant most often misreported in UAE indoor air discussion, because two instruments use the same number on different averaging bases.
The same number appears under both instruments on different bases. Dubai Municipality's eight-hour formaldehyde value is 0.01 ppm, and its 0.08 ppm figure is a thirty-minute short-term value. Al Sa'fat separately and correctly applies 0.08 ppm as an eight-hour time-weighted average. It is therefore incorrect to attribute 0.08 ppm over eight hours to Dubai Municipality.
The practical consequence for an existing building is that a formaldehyde result must be reported on a basis that matches the entry being assessed. A thirty-minute result cannot be read against the 0.01 ppm eight-hour value, and an eight-hour result does not answer the thirty-minute short-term entry.
Where testing is carried out under the guideline, it must be performed by a company or laboratory accredited by EIAC, the Emirates International Accreditation Centre. Accreditation is the condition attached to the measurement itself, so a result produced outside that condition does not support a compliance position under the guideline regardless of the technical care taken.
The accredited body produces the measurement record and reports each concentration on its stated averaging basis. It does not determine whether a building falls inside or outside the guideline's scope, and it does not award anything: clause 9-8-4 produces a completed test rather than a certificate.
An existing building in Dubai may sit inside two instruments at once. Al Sa'fat, the Dubai Green Building System, 2nd edition January 2023, requires listed categories of existing building to apply testing under clause 401.07: hotels, shopping malls, educational facilities, government buildings, healthcare facilities, mosques and worship buildings, theatres and cinemas.
Clause 401.07 sets formaldehyde below 0.08 ppm as an 8-hour time-weighted average, TVOC below 300 micrograms per cubic metre as an 8-hour time-weighted average, carbon dioxide below 800 ppm as an 8-hour time-weighted average, carbon monoxide below 9 ppm as an 8-hour time-weighted average, ozone below 0.06 ppm as an 8-hour time-weighted average, respirable dust below 150 micrograms per cubic metre as an 8-hour time-weighted average, and bacteria and fungi each below 500 CFU per cubic metre as per-sample counts that are not time-weighted. It also sets retesting within 5 years of the last compliant test, an interval that belongs to Al Sa'fat alone.
A hotel in Dubai therefore reads clause 9-8-4 and clause 401.07 together, noting that the TVOC figures differ between them and that the two documents express formaldehyde differently. Neither instrument displaces the other, and a single testing exercise satisfies both only if it is designed against both sets of values and bases.
Clause 9-8-4 states that indoor air testing for the contaminants in Table 2 must be carried out, with no optional qualifier.
TVOC 0.6 mg/m3 over 8 hours, twice as lenient as the Table 1 value of 300 micrograms per cubic metre over 8 hours.
Carbon dioxide 800 ppm, carbon monoxide 9 ppm and ozone 0.06 ppm, each over 8 hours.
No validity period or retest interval is published for the Dubai Municipality certificate.
Dubai Municipality's Technical Guidelines for Indoor Air Quality for Healthy Life, reference DM-HSD-GU119-IAQ, Version 4, issued 11 December 2024, address existing buildings at clause 9-8-4, which states that indoor air testing for the contaminants in Table 2 must be carried out. Clause 9-8-3 separately operates a voluntary certification route for new buildings. Testing must be by a company or laboratory accredited by EIAC, the Emirates International Accreditation Centre.
The guideline's scope excludes premises exclusively dedicated to industrial and medical sectors, for example hospitals and factories.
Clause 9-8-4 of Dubai Municipality's Technical Guidelines for Indoor Air Quality for Healthy Life, DM-HSD-GU119-IAQ Version 4 of 11 December 2024, states that indoor air testing for the contaminants in Table 2 must be carried out for existing buildings. The clause carries no optional qualifier, in contrast with clause 9-8-3, which covers new buildings and describes a route that buildings optionally apply. Premises exclusively dedicated to industrial and medical sectors fall outside the guideline's scope.
Table 2 sets TVOC at 0.6 mg/m3 over 8 hours, formaldehyde at 0.01 ppm over 8 hours with a 0.08 ppm short-term value, equal to 0.1 mg/m3, over 30 minutes, carbon dioxide at 800 ppm over 8 hours, carbon monoxide at 9 ppm over 8 hours and ozone at 0.06 ppm over 8 hours. Each value carries its averaging period, and a result reported without that period cannot be assessed against the table.
Table 1, which applies to new buildings under clause 9-8-3, sets TVOC at 300 micrograms per cubic metre over 8 hours. Table 2, which applies to existing buildings under clause 9-8-4, sets 0.6 mg/m3 over 8 hours, which is twice as lenient over the same averaging period. The two tables sit in the same document but attach to different clauses, and the values are not interchangeable.
Clause 9-8-4 describes testing that must be carried out rather than an award. The indoor air quality certificate described in the guideline is awarded by Dubai Municipality under clause 9-8-3 to buildings that optionally apply the procedures, and no validity period or retest interval is published for it. The 5-year retesting interval that appears in UAE indoor air discussion comes from Al Sa'fat clause 401.07 and belongs to that instrument alone.