One hour,350 μg/m 3 not to be exceeded more than 24 times a calendar year,,,
One day,125 μg/m 3 not to be exceeded more than 3 times a calendar year,,,

One hour,200 μg/m 3 not to be exceeded more than 18 times a calendar year,,,
Calendar year,40 μg/m 3,,,

Calendar year,5 µg/m 3,,,
,,,,

Maximum daily eight hour mean,10 mg/m 3,,,

Calendar year,0.5 µg/m 3,,,

One day,50 µg/m 3 , not to be exceeded more than 35 times a calendar year,,,
Calendar year,40 µg/m 3,,,

Calendar year,25 µg/m 3,20% 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 2015,1st January 2015,

Arsenic,6 ng/m 3,31st December 2012,
Cadmium,5 ng/m 3,31st December 2012,
Nickel,20 ng/m 3,31st December 2012,
Benzo(a)pyrene,1 ng/m 3,31st December 2012,

Protection of human health,Maximum daily eight hour mean(a),120 µg/m 3 not to be exceeded on more than 25 days per calendar year averaged over three years(b),,
,,,,
Protection of vegetation,May to July,AOT 40 (calculated from 1h values) 18,000 µg/m 3 .h averaged over five years(b),,

Calendar year,25 µg/m 3,,

Protection of human health,Maximum daily eight hour mean within a calendar year,120 µg/m 3,
,,,
Protection of vegetation,May to July,AOT 40 (calculated from 1h values) 6000 μg/m 3 .h.,

Sulphur dioxide,500 µg/m 3,
Nitrogen dioxide,400 µg/m 3,

Information,1 hour,180 µg/m 3,
Alert,1 hour,240 µg/m 3,

Calendar year and winter (1 October to 31 March),20 µg/m 3,

Calendar year,30 µg/m 3 NO x,