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
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
[μg.m-3.h]

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.