Pollutant | Number of Monitors | Number of Observations | Central monitor Mean (IQR) | Unweighted average Mean (IQR) | Population-weighted average Mean (IQR) |
---|---|---|---|---|---|
8-h ozone, ppbb | 5 | 2205 | 56.7 (26.4) | 54.8 (25.0) | 55.3 (22.6) |
24-h PM10, μg/m3c | 9 | 1563 | 29.4 (13.4) | 29.7 (14.0) | 27.4 (12.4) |
24-h PM2.5, μg/m3d | 11 | 1134 | 19.2 (9.8) | 19.9 (9.1) | 18.4 (8.7) |
24-h PM2.5 sulfate, μg/m3d | 6 | 980 | 6.3 (3.7) | 5.8 (3.6) | 5.8 (3.5) |
24-h PM2.5 organic carbon, μg/m3d | 6 | 1089 | 4.19 (1.92) | 4.60 (2.45) | 4.71 (2.71) |
24-h PM2.5 elemental carbon, μg/m3d | 6 | 1089 | 1.62 (0.91) | 1.25 (0.68) | 0.82 (0.53) |
1-h nitrogen dioxide, ppbb | 6 | 2190 | 42.0 (19.7) | 27.7 (13.5) | 22.0 (10.1) |
1-h carbon monoxide, ppmb | 3 | 1999 | 1.45 (0.83) | 1.39 (0.92) | 0.87 (0.46) |
1-h sulfur dioxide, ppbb | 5 | 2201 | 13.9 (13.0) | 10.2 (7.7) | 9.6 (7.6) |