Open Access

Table 2

Maximum allowable concentrations for some indoor air contaminants.

Contaminant Maximum allowable concentration Health effect when exposed beyond allowable concentration
Formaldehyde 33 ppb (parts per billion) Irritation of the eyes, nose and throat
Particulates (PM10) 150 μg/m3 (24-hr) Breathing/respiratory problems
Particulate (PM2.5) 35 μg/m3 (24-hr) Breathing/respiratory problems
Total Volatile Organic Compounds (TVOC) 300 ppb (parts per billion) Irritation of the eyes, nose and throat, nausea, difficulty in breathing
Carbon monoxide (CO) 9 ppm (parts per million) (8-hr) Headache, dizziness, weakness, nausea, vomiting
Carbon dioxide (CO2) 1000 ppm (parts per million) Headache, dizziness, restlessness, difficulty in breathing, tiredness
Ozone 0.070 ppm (parts per million) (8-hr) Increase in risk of respiratory diseases

Source: ASHRAE, (2019) [8] and Berglund et al. (1992) [39].

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