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

SCHEDULE 4 Assessment thresholds

PART 2 Assessment thresholds for Group B pollutants

Arsenic

Upper assessment threshold	60% of target value (3.6 ng/m3)
Lower assessment threshold	40% of target value (2.4 ng/m3)

Benzo(a)pyrene

Upper assessment threshold	60% of target value (0.6 ng/m3)
Lower assessment threshold	40% of target value (0.4 ng/m3)

Cadmium

Upper assessment threshold	60% of target value (3 ng/m3)
Lower assessment threshold	40% of target value (2 ng/m3)

Nickel

Upper assessment threshold	70% of target value (14 ng/m3)
Lower assessment threshold	50% of target value (10 ng/m3)