Table 2.
Daily average air pollutant concentrations, Sydney, April 1997–December 2000
| Air pollutant | All year | Summer | Autumn | Winter | Spring |
| PM10 (μg/m3) 24 hour average | |||||
| Mean (SD1) | 16.3 (6.38) | 18.2 (7.20) | 17.0 (6.23) | 14.5 (5.57) | 15.7 (5.82) |
| Median (IQR2) | 15.4 (7.51) | 17.0 (8.13) | 16.0 (7.92) | 14.0 (7.47) | 14.97 (6.95) |
| PM2.5 (μg/m3) 24 hour average | |||||
| Mean (SD) | 9.0 (3.94) | 8.7 (4.19) | 9.4 (3.61) | 9.5 (4.22) | 8.5 (3.61) |
| Median (IQR) | 8.2 (4.54) | 7.7 (4.03) | 8.9 (4.57) | 8.8 (5.34) | 7.6 (3.80) |
| O3 (ppb3) 1 hour maximum | |||||
| Mean (SD) | 30.9 (14.19) | 37.7 (18.89) | 28.3 (12.54) | 23.3 (5.78) | 34.3 (11.87) |
| Median (IQR) | 27.2 (13.43) | 33.1 (26.20) | 25.0 (12.51) | 24.0 (5.56) | 31.5 (11.05) |
| NO2 (ppb) 1 hour maximum | |||||
| Mean (SD) | 23.4 (7.58) | 18.0 (7.01) | 25.1 (7.91) | 25.9 (5.43) | 24.4 (7.09) |
| Median (IQR) | 23.0 (9.45) | 16.0 (7.99) | 23.8 (9.51) | 25.7 (6.23) | 23.2 (8.67 |
| CO (ppm4) 8 hour maximum | |||||
| Mean (SD) | 0.9 (0.68) | 0.5 (0.24) | 1.0 (0.69) | 1.3 (0.84) | 0.6 (0.35) |
| Median (IQR) | 0.7 (0.73) | 0.4 (0.32) | 0.9 (0.82) | 1.2 (1.07) | 0.5 (0.49) |
| SO2 (ppb) 1 hour maximum | |||||
| Mean (SD) | 3.6 (1.95) | 3.6 (2.37) | 3.6 (1.93) | 3.8 (1.69) | 3.6 (1.74) |
| Median (IQR) | 3.3 (2.24) | 3.1 (2.58) | 3.3 (2.16) | 3.6 (1.88) | 3.2 (2.30) |
| Temperature (°C) 24 hour average | |||||
| Mean (SD) | 17.7 (4.50) | 22.4 (2.41) | 18.3 (3.45) | 12.4 (1.77) | 17.7 (3.02) |
| Median (IQR) | 17.8 (7.38) | 22.4 (3.50) | 18.4 (5.30) | 12.1 (2.50) | 17.5 (4.10) |
| Relative humidity (%) 24 hour average | |||||
| Mean (SD) | 70.8 (11.49) | 70.2 (10.26) | 73.9 (10.45) | 71.5 (12.06) | 67.5 (12.13) |
| Median (IQR) | 71.4 (14.99) | 69.8 (13.33) | 74.1 (12.82) | 72.0 (15.97) | 67.8 (15.43) |
1SD = Standard deviation; 2IQR = Inter-quartile range; 3ppb = parts per billion; 4ppm = parts per million