Table 2 Frequency distribution of the daily pollution levels for gaseous and particulate phase pollutants
Summer (April to September) | Winter (October to March) | |||||||
|---|---|---|---|---|---|---|---|---|
Days* | 25th P | 75th P | Med | Days* | 25th P | 75th P | Med | |
SO2 (ppb) | 1830 | 1.0 | 3.0 | 2.0 | 1822 | 2.0 | 4.0 | 3.0 |
NO2 (ppb) | 1830 | 14.0 | 22.0 | 17.5 | 1822 | 22.5 | 35.5 | 28.5 |
CO (ppm) | 1830 | 0.5 | 0.7 | 0.6 | 1822 | 0.7 | 1.3 | 0.9 |
O3- daily max (ppb) | 1830 | 29.5 | 46.0 | 38.0 | 1822 | 16.5 | 31.5 | 24.3 |
PM2.5: g/m3 | 715 | 4.5 | 11.0 | 7.0 | 729 | 5.0 | 11.0 | 7.3 |
PM10: g/m3 | 732 | 15.0 | 32.5 | 22.0 | 819 | 13.0 | 29.0 | 19.0 |
Temperature (°C) | 1830 | 9.8 | 17.2 | 13.9 | 1822 | -11.1 | 1.6 | -3.8 |
Relative humidity (%) | 1830 | 53.0 | 72.8 | 63.0 | 1822 | 60.9 | 78.0 | 68.8 |
Aeroallergens†| ||||||||
Grasses (spores/m3) | 1098 | 0.0 | 5.7 | 1.0 | 1093 | 0.0 | 0.0 | 0.0 |
Trees (spores/m3) | 1098 | 0.0 | 42.2 | 3.4 | 1093 | 0.0 | 0.0 | 0.0 |
Weeds (grains/m3) | 1098 | 0.0 | 5.0 | 0.0 | 1093 | 0.0 | 0.0 | 0.0 |
Deuteromycetes (spores/m3) | 1098 | 350.4 | 2303.7 | 1096.9 | 1093 | 0.0 | 0.0 | 0.0 |
Basidiomycetes(spores/m3) | 1098 | 19.1 | 442.8 | 124.8 | 1093 | 0.0 | 0.0 | 0.0 |
Asomycetes (spores/m3) | 1098 | 59.1 | 519.4 | 194.2 | 1093 | 0.0 | 0.0 | 0.0 |