Table 2 Parameter estimates for de minimis individual risk emission threshold regressions for different pollutants.
| Dependent Variable | Independent Variables | |||
|---|---|---|---|---|
| Distance between nearest census block group centroid and airport centroid (km) | Log annual average mixing height (m) | Intercept | R 2 | |
| Log benzene emission threshold (kg/year) |
0.683 (<0.0001) |
1.43 (0.019) |
-1.65 (0.66) | 0.74 |
| Log 1,3-butadiene emission threshold (kg/year) |
0.751 (<0.0001) |
1.40 (0.028) |
-3.23 (0.41) | 0.75 |
| Log BaP emission threshold (g/year) |
0.687 (<0.0001) |
1.42 (0.021) |
-0.019 (0.995) | 0.74 |