# The Air Quality Standards Regulations 2010, Schedule 3: Target values


Ozone
1 The maximum daily eight hour mean concentration shall be selected by examining eight hour running averages, calculated from hourly data and updated each hour. Each eight hour average so calculated shall be assigned to the day on which it ends, that is, 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 the day.
2 If the three or five year averages cannot be determined on the basis of a full and consecutive set of annual data, the minimum annual data required for checking compliance with the target values will be valid data for one year in relation to the target value for the protection of human health and valid data for three years in relation to the target value for the protection of vegetation.
Objective
Averaging period
Target value
Protection of human health
Maximum daily eight hour mean1
120 μg/m3 not to be exceeded on more than 25 days per calendar year averaged over three years2
Protection of vegetation
May to July
AOT 40 (calculated from 1 h values) 18,000 μg/m3 ∙h averaged over five years2
PM 2.5
Averaging period
Target value
Calendar year
25 μg/m3
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
31st December 2012
Cadmium
5 ng/m3
31st December 2012
Nickel
20 ng/m3
31st December 2012
Benzo(a)pyrene
1 ng/m3
31st December 2012

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Source: https://www.legislation.gov.uk/uksi/2010/1001/schedule/3 (the official version)
Page: https://openlegislation.uk/air-quality-standards-regulations-2010/schedule-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.