Table 1.
Descriptive statistics of exposure to criteria pollution within different distance interval to monitoring sites. Mean (standard deviation) and the sample size i.e. # of observations.
| Criteria Pollutant | 3 miles | 6 miles | 9 miles | 12 miles | County | |||||
|---|---|---|---|---|---|---|---|---|---|---|
| Mean (SD) | Sample Size | Mean (SD) | Sample Size | Mean (SD) | Sample Size | Mean (SD) | Sample Size | Mean (SD) | Sample Size (N) | |
| PM2.5 (μg/m3) | 18.0 (4.7) | 43,078 | 17.9 (4.7) | 84,055 | 18.0 (4.6) | 114,332 | 18.0 (4.6) | 114,332 | 18.1 (4.5) | 228,254 |
| PM10 (μg/m3) | 26.5 (4.8) | 10,250 | 26.6 (4.8) | 18,711 | 27.1 (5.1) | 24,540 | 27.1 (5.1) | 24,540 | 27.5 (5.1) | 64,701 |
| NO2 (ppb) | 24.9 (4.2) | 18,200 | 25.2 (4.2) | 37,864 | 25.0 (4.4) | 54,587 | 25.0 (4.4) | 54,587 | 25.1 (4.1) | 134,910 |
| CO (ppb) | 854.0 (311.9) | 13,191 | 822.4 (299.7) | 27,892 | 822.3 (303.0) | 39,347 | 822.3 (303.0) | 39,347 | 815.1 (281.3) | 96,932 |
| O3 (ppb) | 22.8 (5.5) | 35,907 | 22.9 (5.7) | 67,840 | 22.8 (5.6) | 94,017 | 22.8 (5.6) | 94,017 | 22.6 (4.9) | 218,151 |
| SO2 (ppb) | 4.7 (1.3) | 15,696 | 4.7 (1.3) | 34,165 | 4.6 (1.3) | 50,315 | 4.6 (1.3) | 50,315 | 4.6 (1.3) | 129,172 |