Air quality | Index | NO2 (µg∙m−3) | SO2 (µg∙m−3) |
Good | 0 - 50 | 0 - 100 | 0 - 80 |
Regular | 51 - 100 | 100 - 320 | 80 - 365 |
Inadequate | 101 - 199 | 320 - 1130 | 365 - 800 |
Bad | 200 - 299 | 1130 - 2260 | 800 - 1600 |
Too bad | >299 | >2260 | >1600 |