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The Air Quality Standards Regulations (Northern Ireland) 2010

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Regulation 18(1) and (2)

SCHEDULE 2Limit values

This schedule has no associated Explanatory Memorandum

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
(1)

The maximum daily eight hour mean concentration of carbon monoxide shall 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 17.00 on the previous day to 01.00 on that day, the last calculation period for any one day will be the period from 16.00 to 24.00 on that day.

Maximum daily eight hour mean(1)10 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 11 June 2008, decreasing on the next 1 January and every 12 months thereafter by equal annual percentages to reach 0% by 1 January 20151 January 2015

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