| All seasons | Season | ||||
---|---|---|---|---|---|---|
 |  | Cold (October to March) | Warm (April to September) | |||
Pollutants | OR | 95% CI | OR | 95% CI | OR | 95% CI |
PM 10 | 1.022 | 1.013-1.031 | 1.018 | 1.008-1.029 | 1.039 | 1.020-1.058 |
SO 2 | 1.044 | 1.003-1.086 | 0.983 | 0.908-1.064 | 1.068 | 1.014-1.126 |
CO b | 1.023 | 1.001-1.047 | 0.991 | 0.965-1.017 | 1.128 | 1.074-1.184 |
NO 2 | 1.015 | 1.004-1.026 | 1.000 | 0.984-1.015 | 1.043 | 1.021-1.065 |