SMOG warning
The smog warning system includes NO2, SO2 and O3
The population is informed if the hourly concentration of:
- NO2 or SO2 exceeds 350 µg/m3 for more than three consecutive hours and an immediate improvement is not expected.
- O3 exceeds 180 µg/m3
A warning is issued if the hourly concentration of O3 exceeds 360 µg/m3
Updated 970512,K. Kemp