Regression of respiratory function (PEF, FEV1 and FVC) on pollutant level* (previous day)
| Estimate† (per unit change) (95% CI) | p Value | Estimate‡ (per IQR change) | |
| PEF (l/min) n=94 | |||
| NO2 (ppb) | 0.013 (0.002 to 0.024) | 0.026 | 0.179 |
| O3 (ppb) | −0.015 (−0.039 to 0.009) | 0.229 | −0.211 |
| SO2 (ppb) | 0.031 (−0.010 to 0.072) | 0.133 | 0.191 |
| PM10 (μg/m3) | 0.009 (−0.006 to 0.023) | 0.253 | 0.164 |
| Black smoke (μg/m3) | 0.011 (−0.005 to 0.028) | 0.180 | 0.103 |
| FEV1 (ml) n=28 | |||
| NO2 (ppb) | 0.005 (−0.106 to 0.116) | 0.929 | 0.071 |
| O3 (ppb) | −0.081 (−0.258 to 0.096) | 0.369 | −1.143 |
| SO2 (ppb) | −0.035 (−0.386 to 0.315) | 0.843 | −0.216 |
| PM10 (μg/m3) | 0.031 (−0.067 to 0.129) | 0.536 | 0.588 |
| Black smoke (μg/m3) | 0.045 (−0.113 to 0.203) | 0.576 | 0.405 |
| FVC (ml) n=28 | |||
| NO2 (ppb) | 0.071 (−0.189 to 0.332) | 0.591 | 1.000 |
| O3 (ppb) | 0.162 (−0.238 to 0.562) | 0.426 | 2.288 |
| SO2 (ppb) | −0.335 (−1.192 to 0.522) | 0.444 | −2.043 |
| PM10 (μg/m3) | 0.187 (−0.017 to 0.392) | 0.073 | 3.561 |
| Black smoke (μg/m3) | 0.166 (−0.218 to 0.551) | 0.396 | 1.498 |
↵* In addition to individual pollutants (previous day), each model includes outdoor temperature (average of the minimum and maximum) and season (four categories) plus control for autocorrelation.
↵† Estimates represent the change in lung function for a 1 unit change in pollutant level (ppb for NO2, O3, SO2; μg/m3 for PM10, black smoke).
↵‡ Estimates represent the change in lung function for an IQR change in pollutant level.
FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; PEF, peak expiratory flow; PM, particulate matter.