Relative risk (with 95% CI) for the pollutants per 10 μg/m3 increase in the concentration of air pollutants for hospitalisations due to an acute exacerbation of COPD (multipollutant model)
| NO2(lag 0–3) | O3 (8 h)(lag 0–5) | SO2(lag 0) | PM2.5(lag 0–5) | |
|---|---|---|---|---|
| SO2, sulphur dioxide; NO2, nitrogen dioxide; O3, ozone; PM10, PM2.5, particulates with an aerodynamic diameter <10 μm or <2.5 μm. | ||||
| *p<0.05. | ||||
| †Highest χ2 score in the pollutant model. | ||||
| 4 pollutant model | 0.993 (0.985 to 1.001) | 1.029 (1.022 to 1.036)*† | 1.008 (1.001 to 1.015)* | 1.014 (1.007 to 1.022)* |
| 3 pollutant model | 1.029 (1.022 to 1.034)*† | 1.008 (1.001 to 1.015)* | 1.011 (1.004 to 1.017)* | |