Limit values (LV) for the protection of ecosystems and vegetation
| Pollutant | Averaging interval | Assessment threshold [μg.m-3] | Air pollution limit value [μg.m-3] LV |
Date for achieving LV | |
| Upper UAT |
Lower LAT |
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| SO2 | year and winter period (1.10.-31.3.) | 8 | 12 | 20 | — |
| NOx | calendar year | 19.5 | 24 | 30 | — |
Target value and long-term objective for the protection of ecosystems
| Pollutant | Averaging interval | Long-term objective [μg.m-3.h] |
Target value with effect from 31.12.2009 |
| O3 | AOT40, calculated from 1h values between May and July |
6 000 | 18 000 average for 5 years |
Note:
AOT40 is the sum of differences between the hourly concentration higher than 80
μg.m-3 (= 40 ppb) and the value 80 μg.m-3 in the given
period by using only hourly values measured every day between 8:00 and 20:00 CET.