Adjusted RRs of hospital admission for respiratory diseases in children <5 in single and multipollutant models (RRs are for an increase from the 10th to the 90th centile in daily concentration of each pollutant)
| Single pollutant model | Two pollutant model (NO2 and O3) | Two pollutant model (PM10 and NO2) | Two pollutant model (PM10 and O3) | Three pollutant model | |
| PM10 | 1.040 (0.985–1.099) | 1.058 (0.962–1.160) | 1.058 (0.993–1.128) | 1.044 (0.946–1.151) | |
| NO2 | 1.063 (0.999–1.132) | 1.050 (0.985–1.120) | 1.043 (0.972–1.119) | 1.035 (0.963–1.113) | |
| O3 | 1.054 (1.003–1.107) | 1.071 (1.008–1.139) | 1.045 (0.994–1.099) | 1.065 (0.999–1.134) |