Data, units of measurement and averaging times:
Pollutant Average Expressed as over
1. SO2 sulphur dioxide 24 h
2. AD acid deposition 1 month
3. SA strong acidity 24 h SO2 equivalent
4. SPM suspended particles (total) 24 h
5. PM10 suspended particles 24 h ( 10 µm)
6. BS black smoke 24 h ...
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