TABLE 3.
Distribution of daily mean (standard deviation) concentration of pollutants and number of days per weighted average-AQHI value in Cape Town for the period from 2006 to 2015 (in total, 3,652 days) Cape Town, South Africa 2006 and 2015.
| Single -AQHI | PM10 | NO2 | SO2 | O3 | ||||
|---|---|---|---|---|---|---|---|---|
| µg/m3 | Days | µg/m3 | Days | µg/m3 | Days | µg/m3 | Days | |
| 13 | — | — | — | — | 8.3 (4.7) | 3 (0.1%) | — | — |
| 2 | 15.1 (3.2) | 33 (0.9%) | 3.9 (1.4) | 4 (0.1%) | 7.2 (2.9) | 30 (0.8%) | 30.8 (10.3) | 24 (0.7%) |
| 3 | 19.3 (5.6) | 419 (11.4%) | 7.2 (2.8) | 265 (7.3%) | 8.0 (4.1) | 398 (10.9%) | 32.4 (10.9) | 308 (8.4%) |
| 4 | 22.5 (7.8) | 1,015 (27.8%) | 11.0 (3.8) | 916 (25.1%) | 8.9 (4.3) | 984 (26.9%) | 30.9 (12.6) | 715 (19.6%) |
| 5 | 29.1 (10.2) | 954 (26.1%) | 15.3 (5.1) | 875 (24.0%) | 10.0 (4.6) | 945 (25.9%) | 33.9 (12.5) | 720 (19.7%) |
| 6 | 36.2 (10.9) | 602 (16.5%) | 18.7 (6.1) | 601 (16.5%) | 11.5 (5.3) | 598 (16.4%) | 35.2 (12.3) | 440 (12.0%) |
| 7 | 42.8 (11.3) | 345 (9.4%) | 24.6 (6.6) | 345 (9.4%) | 12.6 (4.7) | 337 (9.2%) | 34.7 (12.4) | 249 (6.8%) |
| 8 | 51.6 (11.0) | 241 (6.6%) | 32.8 (7.1) | 214 (6.6%) | 16.6 (6.3) | 241 (6.6%) | 32.5 (11.4) | 181 (5.0%) |
| 9 | 65.1 (13.2) | 37 (1.0%) | 41.8 (8.3) | 37 (1.0%) | 26.8 (5.3) | 37 (1.0%) | 30.7 (11.3) | 35 (1.0%) |
| Missing | — | 9(0.3%) | — | 368 (10.1%) | — | 79(2.2%) | — | 980 (26.8%) |