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The Air Quality Standards (Scotland) Regulations 2010

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Regulations 17(1) and (2),19(2), 24(1) and (4), 25(5), 28(2)

SCHEDULE 2Limit values

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Sulphur dioxide

Averaging periodLimit value
One hour350 μg/m3 not to be exceeded more than 24 times a calendar year
One day125 μg/m3 not to be exceeded more than 3 times a calendar year

Nitrogen dioxide

Averaging periodLimit value
One hour200 μg/m3 not to be exceeded more than 18 times a calendar year
Calendar year40 μg/m3

Benzene

Averaging periodLimit value
Calendar year5 µg/m3

Carbon monoxide

Averaging periodLimit value
The maximum daily eight hour mean concentration of carbon monoxide must be selected by examining eight hour running averages, calculated from hourly data and updated each hour. Each eight hour average so calculated will be assigned to the day on which it ends, i.e. the first calculation period for any one day will be the period from 1700 hours on the previous day to 0100 hours on that day, the last calculation period for any one day will be the period from 1600 hours to 2400 hours on that day.
Maximum daily eight hour mean10 mg/m3

Lead

Averaging periodLimit value
Calendar year0.5 µg/m3

PM10

Averaging periodLimit value
One day50 µg/m3, not to be exceeded more than 35 times a calendar year
Calendar year40 µg/m3

PM2.5

Averaging periodLimit valueMargin of toleranceDate by which limit value is to be met
Calendar year25 µg/m320% on 11th June 2008, decreasing on the next 1st January and every 12 months thereafter by equal annual percentages to reach 0% by 1st January 20151st January 2015

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