Table 2.
Ambient air measurements for study period
| Environmental variable | Median (interquartile range) | Pearson correlation (95% CI)a with School 1 black carbon | Pearson correlation (95% CI)a with School 2 black carbon |
|---|---|---|---|
| School 1 daily average black carbon (μg/m3) | 1.53 (1.00) | ||
| School 2 daily average black carbon (μg/m3) | 0.96 (0.44) | 0.70 (0.43, 0.86) | |
| Daily average PM2.5 (μg/m3)b | 10.0 (9.3) | 0.72 (0.47, 0.87) | 0.40 (0.01, 0.68) |
| Daily average NO2 (ppb)c | 23.3 (8.6) | 0.80 (0.63, 0.89) | 0.62 (0.36, 0.79) |
| Daily maximum 8- hour average O3 (ppb)c | 38.8 (15.5) | 0.13 (−0.21, 0.44) | 0.08 (−0.26, 0.40) |
| Daily average temperature (°C)d | 17.5 (8.6) | 0.26 (−0.14, 0.59) | 0.31 (−0.09, 0.62) |
BC = black carbon, PM2.5 = fine particulate matter, NO2 = nitrogen dioxide, O3 = ozone
a
95% CIs were calculated from a Fisher transformation of Pearson correlation.
b
Measured at a central monitoring site less than 10 km from schools.
c
Measured at a central monitoring site less than 14 km from schools.
d
Measured at Central Park, New York City.