Graphic Yearbook 2014
Tab. IV.4.1 Air quality index based on concentrations of
pollutants
| Index | Air quality | NO2 hourly concentration [µg.m-3] |
O3 hourly concentration [µg.m-3] |
PM10 hourly concentration [µg.m-3] |
| 1 | very good | 0–25 | 0–33 | 0–20 |
| 2 | good | > 25–50 | > 33–65 | > 20–40 |
| 3 | fair | > 50–100 | > 65–120 | > 40–70 |
| 4 | suitable | > 100–200 | > 120–180 | > 70–90 |
| 5 | poor | > 200–400 | > 180–240 | > 90–180 |
| 6 | very poor | > 400 | > 240 | > 180 |
