Annual average pollutant concentration range and correlation matrix for respondents within 5 miles (≃ 8 km) of a monitoring station
| Median (interquartile range, 25–75%) | Correlation matrix (no of respondents) | |||||
| O3 (ppb) | PM10 (μg/m3) | PM2.5 (μg/m3) | NO2 (ppb) | CO (ppm) | ||
| O3 (ppb) | 30.3 (27.1 to 34.0) | 1 (759) | ||||
| PM10 (μg/m3) | 42.7 (31.7 to 44.3) | 0.50 (724) | 1 (774) | |||
| PM2.5 (μg/m3) | 21.4 (17.9 to 23.5) | 0.52 (591) | 0.89 (617) | 1 (617) | ||
| NO2 (ppb) | 19.0 (16.0 to 21.4) | –0.53 (675) | –0.31 (643) | –0.06 (510) | 1 (675) | |
| CO (ppm) | 0.56 (0.53 to 0.65) | –0.12 (562) | 0.46 (538) | 0.48 (505) | 0.01 (562) | 1 (562) |
CO, carbon monoxide; NO2, nitrogen dioxide; O3, ozone; PM10, particulate matter less than 10 μm in aerodynamic diameter; PM2.5, particulate matter less than 2.5 μm in aerodynamic diameter.