Table 2.
Distribution of ambient air pollution concentrations at home and schools.
| Air pollutants | Min | Percentile |
Max | IQR | WHO guidelines | ||
|---|---|---|---|---|---|---|---|
| p33.3 | p50 | P66.7 | |||||
| NO2 - home | 1.7 | 39.6 | 44.4 | 47.9 | 97.0 | 13.7 | 40 |
| NO2 - school | 25.9 | 46.1 | 48.5 | 54.4 | 84.6 | 22.3 | 40 |
| PM2.5 - home | 6.1 | 12.7 | 13.4 | 14.3 | 25.0 | 2.7 | 10 |
| PM2.5 - school | 10.0 | 20.1 | 25.0 | 28.2 | 85.4 | 10.7 | 10 |
| PM10 - home | 15.2 | 28.0 | 30.0 | 31.6 | 45.3 | 5.6 | 20 |
| PMcoarse - home | 8.2 | 16.0 | 17.4 | 18.4 | 23.5 | 3.7 | – |
| EC - school | 0.6 | 1.1 | 1.3 | 1.5 | 3.9 | 0.9 | – |
| UFP - school | 11,939 | 17,612 | 22,157 | 27,346 | 51,146 | 13,010 | – |
Units are μg/m3 (NO2, PM2.5, PM10, PMcoarse, and EC) or number of particles per cubic centimeter (UFP). IQR = interquartile range.