Association of cumulative air pollution exposure and disease progression
| Exposure | Increase | HR (95% CI) | p Value |
| O3 | 10 µg/m3 | 1.06 (0.74 to 1.54) | 0.72 |
| NO2 | 10 µg/m3 | 1.09 (0.85 to 1.40) | 0.52 |
| PM10 | 10 µg/m3 | 1.03 (0.51 to 2.08) | 0.92 |
| PM2.5 | 10 µg/m3 | 1.89 (0.68 to 5.23) | 0.22 |
Cox proportional hazards model adjusted on age, FVC% predicted at base line and DLco% predicted at baseline.
NO2, nitrogen dioxide; O3, ozone; PM10 and PM2.5, particles with a 50% cut-off aerodynamic diameter of 10 µm and 2.5 µm.