Review Article
A Systematic Review on Indoor Environmental Quality in Naturally Ventilated School Classrooms: A Way Forward
Table 4
Air quality parameters and their suitable range.
| | Parameters | Suitable concentration | | EPA | WHO | OSHA | Canadian |
| | Major influential | CO2 | — | — | 5000 ppm | 3500 (L) | | CO | 9 ppm | 90 ppm [15 min] | 50 ppm | 11 ppm [8 h] | | PM2.5 | 15 µg/m3 [1 yr] | — | 5 mg/m3 | 0.1 mg/m3 [1 h] | | Minor influential | PM 10 | µg/m3 | — | — | — | | CH2O (formaldehyde) | — | 0.081 ppm[30 min] | 0.75 ppm | 0.1 ppm (L) | | SO2 | 0.03 [1 yr] | 0.048 ppm [24 h] | 5 | 0.019 ppm | | NO2 | 0.05 [1 yr] | 0.1 ppm [1 h] | 5 ppm (C) | 0.05 ppm | | O3 | 0.12 [1 h]0.08 | 0.064 ppm [8 h] | 0.1 ppm | 0.12 ppm [1 h] |
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