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The NAQS objectives for the seven pollutants

Pollutant Concentration Measured as To be achieved by
Benzene 16.25 µ g/m2 (5 ppb) Running annual mean 31 Dec 2003
Benzene 5 µg/m2 (1.5 ppb) Annual mean 31 Dec 2010
1,3 Butadiene 2.25 µ g/m2 g/m2 (1 ppb) Running annual mean 31 Dec 2003
Carbon Monoxide 11.6 µ g/m2 g/m2 (10 ppb) Running 8 hour mean 31 Dec 2003
Carbon Monoxide 10 mg/m2 (8.6 ppb) Maximum daily 8 hour mean 31 Dec 2003
Lead 0.5 µ g/m2 Annual mean 31 Dec 2004
Lead 0.25 µ g/m2 Annual mean 31 Dec 2008
Nitrogen Dioxide 200 µ g/m2 (105 pbb) not to be exceeded more than 18 times a year 1 hour mean 31 Dec 2005
Nitrogen Dioxide 40 µ g/m2 (21 ppb) Annual mean 31 Dec 2005
Particles (PM10) 50 µ g/m2 not to be exceeded more than 35 times a year 24 hour mean 31 Dec 2004
Particles (PM10) 50 µg/m2 not to be exceeded more than 18 times a year 24 hour mean 31 Dec 2010
Particles (PM10) 40 µ g/m2 Annual mean 31 Dec 2004
Particles (PM10) 23 µ g/m2 Annual mean 31 Dec 2010
Particles (PM10) 20 µ g/m2 Annual mean 31 Dec 2015
Sulphur Dioxide 350 µ g/m2 (132 pbb) not to be exceeded more than 24 times a year 1 hour mean 31 Dec 2004
Sulphur Dioxide 15 µ g/m2 (47 ppb) mot to be exceeded more than 3 times a year 24 hour mean 31 Dec 2004
Sulphur Dioxide 266 µ g/m2 (100 ppb) not to be exceeded more than 35 times a year 15 minute mean 31 Dec 2005

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