Table 3 Mean census-tract NO 2 concentration (μg/m 3 ) by socioeconomic index category (based on occupation) and educational level
Land | SE index* a | NO2 | Education* b | NO2 | ||||
|---|---|---|---|---|---|---|---|---|
n | Mean | S. D. | n | Mean | S. D. | |||
Urban <50% | 1.04-1.24 | 11 | 18.71 | 4.31 | 2.72-3.03 | 11 | 17.14 | 6.11 |
1.25-1.34 | 16 | 13.29 | 3.55 | 3.04-3.24 | 13 | 13.40 | 4.62 | |
1.35-1.46 | 10 | 11.69 | 4.81 | 3.25-3.49 | 25 | 10.01 | 3.97 | |
1.47-1.65 | 24 | 12.43 | 5.65 | 3.50-3.82 | 12 | 13.30 | 6.04 | |
1.66-2.05 | 5 | 5.39 | 1.94 | 3.83-4.26 | 8 | 15.27 | 6.14 | |
Urban ≥50% | 1.04-1.24 | 14 | 22.15 | 5.85 | 2.72-3.03 | 3 | 14.91 | 6.01 |
1.25-1.34 | 23 | 21.95 | 4.87 | 3.04-3.24 | 10 | 23.89 | 5.62 | |
1.35-1.46 | 14 | 23.99 | 1.60 | 3.25-3.49 | 26 | 23.06 | 3.68 | |
1.47-1.65 | 10 | 25.35 | 1.58 | 3.50-3.82 | 15 | 23.23 | 3.89 | |
1.66-2.05 | 2 | 24.29 | 0.81 | 3.83-4.26 | 10 | 25.41 | 1.51 | |
All | 1.04-1.24 | 25 | 20.64 | 5.42 | 2.72-3.03 | 14 | 16.66 | 5.93 |
1.25-1.34 | 39 | 18.40 | 6.11 | 3.04-3.24 | 23 | 17.96 | 7.27 | |
1.35-1.46 | 24 | 18.87 | 6.99 | 3.25-3.49 | 51 | 16.66 | 7.60 | |
1.47-1.65 | 34 | 16.23 | 7.66 | 3.50-3.82 | 27 | 18.82 | 6.99 | |
1.66-2.05 | 7 | 10.79 | 9.36 | 3.83-4.26 | 18 | 20.90 | 6.60 | |