Skip to main content
. 2011 Dec 5;8(12):4502–4520. doi: 10.3390/ijerph8124502

Table 3.

Indoor air quality guidelines (based on [20,21]).

CO CO2 PM0.5 TVOCs Indoor Air Quality Rating
<5 ppm, 8-h average ≤750 ppm, daily average ≤10 μg/m3, daily average ≤500 μg/m3, daily average Acceptable
5–9 ppm, 8-h average 751–999 ppm, daily average 11–25 μg/m3, daily average 501–3000 μg/m3, daily average Action recommended for sensitive groups 1
    26–35 μg/m3, daily average   Action recommended
>20 ppm, 1-h average and/or >9 ppm, 8-h average >999 ppm, daily average >35 μg/m3, daily average >3000 μg/m3, daily average Action necessary

1 Sensitive groups are defined as: “the elderly; children under the age of 18; asthma and allergy sufferers; pregnant women and their unborn children; immuno-compromised individuals; and those with cardiovascular, respiratory, and other chronic disease conditions” [20,21].