# Air Quality Regulations (Northern Ireland) 2003, Schedule: Air Quality Objectives

Extent: N.I.
Status: prospective

Pollutant
Air Quality objective levels
Date to be achieved by
(1)
(2)
(3)
*μg/m3: micrograms per cubic metre
ppb/ppm: parts per billion/million
mg/m3: milligrams per cubic metre
Benzene
16.25μg/m3 (5ppb) when expressed as a running annual mean
31 December 2003
3.25μg/m3 when expressed as a running annual mean
31 December 2010
1,3-butadiene
2.25μg/m3 (1ppb) when expressed as a running annual mean
31 December 2003
Carbon monoxide
10mg/m3 (8.6ppm) when expressed as a maximum daily running 8 hour mean
31 December 2003
Lead
0.5μg/m3 when expressed as an annual mean
31 December 2004
0.25mg/m3 when expressed as an annual mean
31 December 2008
Nitrogen dioxide
200μg/m3 (105ppb) when expressed as a 1 hour mean, not to be exceeded more than 18 times a year
31 December 2005
40μg/m3 (21ppb) when expressed as an annual mean
31 December 2005
Sulphur dioxide
350μg/m3 (132ppb) when expressed as a 1 hour mean, not to be exceeded more than 24 times a year
31 December 2004
125μg/m3 (47ppb) when expressed as a 24 hour mean, not to be exceeded more than 3 times a year
31 December 2004
266μg/m3 (100ppb) when expressed as a 15 minute mean, not to be exceeded more than 35 times a year
31 December 2005
Particles (PM10)
50μg/m3 when expressed as a 24 hour mean, not to be exceeded more than 35 times a year
31 December 2004
40μg/m3 when expressed as an annual mean
31 December 2004

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Source: https://www.legislation.gov.uk/nisr/2003/342/schedule (the official version)
Page: https://openlegislation.uk/air-quality-regulations-northern-ireland-2003/schedule
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.