Table 2.
Concentrations of ambient air pollutants (percentile, μg/m3).
| Pollutants1 | Clean days | Smog days | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Min | 25th | 50th | 75th | Max | Min | 25th | 50th | 75th | Max | |
| PM2.5 | 16.3 | 26.3 | 29.0 | 37.3 | 84.7 | 38.3 | 38.3 | 60.3 | 84.7 | 149.3 |
| PM10 | 17.7 | 53.7 | 55.3 | 76.7 | 118.0 | 68.3 | 68.3 | 102.0 | 138.0 | 162.0 |
| NO2 | 17.7 | 33.3 | 43.3 | 44.7 | 55.0 | 25.7 | 25.7 | 44.7 | 48.7 | 69.7 |
| SO2 | 2.3 | 4.0 | 6.7 | 10.0 | 10.3 | 4.0 | 4.0 | 8.0 | 10.0 | 18.0 |
| O3 | 40 | 40 | 48 | 77 | 94 | 30 | 62 | 119 | 151 | 177 |
1Concentration of PM2.5, PM10, NO2, and SO2 was the 3-day moving average concentration; ozone (O3) was the maximum daily 8-hour mean concentration.