Table 1.
Air pollution concentration on the day of respiratory mortality and Pearson correlation coefficients between air pollutants.
| Air pollutants (μg/m3) | Mean ± SD | Pearson correlation |
|||
|---|---|---|---|---|---|
| PM2.5 | PM10 | NO2 | O3 | ||
| PM2.5 | 37.3 ± 21.2 | 1.00 | 0.91 | 0.76 | 0.46 |
| PM10 | 52.3 ± 28.2 | 1.00 | 0.68 | 0.51 | |
| NO2 | 57.7 ± 20.1 | 1.00 | 0.27 | ||
| O3 | 35.2 ± 20.2 | 1.00 | |||
Abbreviations: SD=standard deviation; PM2.5= particulate matter with aerodynamic diameter ≤ 2.5μm; PM10= particulate matter with aerodynamic diameter ≤ 10μm; NO2=nitrogen dioxide; O3=ozone.