The Air Quality Standards (Scotland) Regulations 2007 No. 182

SCHEDULE 3 Alert and information thresholds

PART 1 Alert thresholds for nitrogen dioxide and sulphur dioxide

Nitrogen dioxide	400 μg/m3 measured over three consecutive hours at locations representative of air quality over at least 100 km2 or an entire zone or agglomeration, whichever is the smaller
Sulphur dioxide	500 μg/m3 measured over three consecutive hours at locations representative of air quality over at least 100 km2 or an entire zone or agglomeration, whichever is the smaller