Association* between air pollution (per IQR increase in mean 5-day (lag 0–4) levels) and hospital admission for asthma in children: two-pollutant models
| n | OR (95% CI) | p Value | |
| NOx | 8155 | 1.11 (1.05 to 1.17) | <0.01 |
| Adjusted for NO2 | 8155 | 1.12 (0.96 to 1.31) | 0.15 |
| Adjusted for PM10 | 8155 | 1.08 (1.01 to 1.14) | 0.02 |
| Adjusted for PM2.5 | 6329 | 1.10 (1.03 to 1.17) | <0.01 |
| Adjusted for UFPs | 7004 | 1.10 (1.03 to 1.18) | <0.01 |
| NO2 | 8155 | 1.10 (1.04 to 1.16) | <0.01 |
| Adjusted for NOx | 8155 | 0.99 (0.85 to 1.16) | 0.89 |
| Adjusted for PM10 | 8155 | 1.08 (1.01 to 1.15) | 0.02 |
| Adjusted for PM2.5 | 6329 | 1.12 (1.05 to 1.19) | <0.01 |
| Adjusted for UFPs | 7004 | 1.13 (1.05 to 1.22) | <0.01 |
| PM10 | 8155 | 1.07 (1.03 to 1.12) | <0.01 |
| Adjusted for NOx | 8155 | 1.05 (1.00 to 1.09) | 0.04 |
| Adjusted for NO2 | 8155 | 1.04 (1.00 to 1.09) | 0.06 |
| Adjusted for PM2.5 | 6315 | 1.09 (1.00 to 1.18) | 0.05 |
| Adjusted for UFPs | 7004 | 1.08 (1.03 to 1.14) | <0.01 |
| PM2.5 | 6329 | 1.09 (1.04 to 1.13) | <0.01 |
| Adjusted for NOx | 6329 | 1.07 (1.02 to 1.11) | <0.01 |
| Adjusted for NO2 | 6329 | 1.06 (1.02 to 1.11) | 0.01 |
| Adjusted for PM10 | 6315 | 1.02 (0.94 to 1.10) | 0.67 |
| Adjusted for UFPs | 5692 | 1.08 (1.03 to 1.13) | <0.01 |
| UFPs | 7004 | 1.06 (0.98 to 1.14) | 0.14 |
| Adjusted for NOx | 7004 | 1.00 (0.91 to 1.08) | 0.91 |
| Adjusted for NO2 | 7004 | 0.97 (0.89 to 1.06) | 0.56 |
| Adjusted for PM10 | 7004 | 0.99 (0.92 to 1.08) | 0.90 |
| Adjusted for PM2.5 | 5692 | 0.99 (0.91 to 1.08) | 0.85 |
↵* Adjusted for dew point, wind speed and global radiation.
IQR, interquartile range; NOx, nitrogen oxides; NO2, nitrogen dioxide; PM10, PM2.5, particulate matter with aerodynamic diameter ≤10 μm and 2.5 μm; UFPs, ultrafine particles.