Pollutants

Suggested Level

PM2.5

10 µg/m3 (Annual Average)/25 µg/m3 (24-hour Average)

PM10

20 µg/m3 (Annual Average)/50 µg/m3 (24-hour Average)

O3

100 µg/m3 (8-hour Average)

NO2

40 µg/m3 (Annual Average)/200 µg/m3 (1-hour Average)

SO2

20 µg/m3 (24-hour Average)/500 µg/m3 (10-minute Average)