Pollutant | Mean | IQR | All seasons | Season | ||||
---|---|---|---|---|---|---|---|---|
 |  |  |  |  | October to March | April to September | ||
 |  |  | OR | 95% C.I. | OR | 95% C.I. | OR | 95% C.I. |
SO2 | Same day | 3.0 | 1.01 | 0.94–1.09 | 1.01 | 0.91–1.11 | 1.00 | 0.89–1.13 |
 | 1-day lag |  | 0.94 | 0.87–1.01 | 0.92 | 0.84–1.01 | 0.95 | 0.84–1.07 |
 | 3-day average |  | 0.98 | 0.87–1.09 | 0.95 | 0.83–1.09 | 1.00 | 0.83–1.21 |
 | 5-day average |  | 0.97 | 0.86–1.11 | 0.97 | 0.83–1.14 | 0.95 | 0.76–1.18 |
NO2 | Same day | 13.5 | 1.03 | 0.96–1.11 | 1.04 | 0.96–1.14 | 0.99 | 0.86–1.16 |
 | 1-day lag |  | 0.99 | 0.92–1.07 | 0.99 | 0.90–1.08 | 1.00 | 0.86–1.16 |
 | 3-day average |  | 1.05 | 0.96–1.16 | 1.05 | 0.94–1.17 | 1.06 | 0.88–1.29 |
 | 5-day average |  | 1.09 | 0.97–1.21 | 1.07 | 0.94–1.22 | 1.12 | 0.89–1.41 |
CO | Same day | 0.5 | 1.01 | 0.96–1.07 | 1.01 | 0.95–1.07 | 1.03 | 0.88–1.21 |
 | 1-day lag |  | 0.98 | 0.92–1.04 | 0.97 | 0.92–1.04 | 1.00 | 0.84–1.19 |
 | 3-day average |  | 1.01 | 0.94–1.09 | 1.00 | 0.93–1.09 | 1.03 | 0.82–1.29 |
 | 5-day average |  | 1.02 | 0.94–1.11 | 1.01 | 0.93–1.11 | 1.02 | 0.78–1.35 |
O3 | Same day | 18.0 | 0.96 | 0.87–1.07 | 0.94 | 0.81–1.09 | 1.01 | 0.87–1.18 |
 | 1-day lag |  | 1.03 | 0.94–1.13 | 1.03 | 0.90–1.18 | 1.05 | 0.92–1.20 |
 | 3-day average |  | 0.99 | 0.88–1.13 | 0.92 | 0.76–1.10 | 1.12 | 0.93–1.34 |
 | 5-day average |  | 1.00 | 0.87–1.15 | 0.90 | 0.73–1.11 | 1.14 | 0.94–1.39 |
PM2.5 ‡ | Same day | 6.3 | 1.04 | 0.97–1.12 | 1.04 | 0.92–1.18 | 1.06 | 0.96–1.16 |
 | 1-day lag |  | 1.00 | 0.92–1.08 | 0.99 | 0.88–1.11 | 1.01 | 0.91–1.11 |
 | 3-day average |  | 1.06 | 0.97–1.17 | 1.08 | 0.93–1.26 | 1.06 | 0.94–1.20 |
 | 5-day average |  | 1.10 | 0.98–1.23 | 1.12 | 0.94–1.34 | 1.10 | 0.95–1.27 |
PM10 ‡ | Same day | 16.0 | 1.06 | 0.97–1.15 | 1.04 | 0.92–1.17 | 1.10 | 0.98–1.23 |
 | 1-day lag |  | 1.00 | 0.92–1.09 | 0.98 | 0.87–1.11 | 1.03 | 0.91–1.15 |
 | 3-day average |  | 1.08 | 0.97–1.19 | 1.06 | 0.91–1.23 | 1.11 | 0.96–1.27 |
 | 5-day average |  | 1.10 | 0.98–1.24 | 1.10 | 0.92–1.31 | 1.12 | 0.95–1.32 |