# The Air Quality Standards (Wales) Regulations 2010, Paragraph

Extent: E+W

Arsenic, cadmium, nickel and benzo(a)pyrene
Pollutant
Target value for the total content in the PM10 fraction averaged over a calendar year
Date by which target value should be met
Arsenic
6 ng/m3
31 December 2012
Cadmium
5 ng/m3
31 December 2012
Nickel
20 ng/m3
31 December 2012
Benzo(a)pyrene
1 ng/m3
31 December 2012
Ozone
Objective
Averaging period
Target value
Protection of human health
Maximum daily eight hour mean
120 μg/m3, not to be exceeded on more than 25 days per calendar year averaged over three years
Protection of vegetation
May to July
AOT 40 (calculated from 1h values) 18,000 μg/m3 · h averaged over five years
PM2·5
Averaging period
Target value
Calendar year
25 μg/m3

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Source: https://www.legislation.gov.uk/wsi/2010/1433/schedule/2/paragraph/wrapper2n1 (the official version)
Page: https://openlegislation.uk/air-quality-standards-wales-regulations-2010/schedule-2/paragraph-wrapper2n1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.