# The Environmental Targets (Fine Particulate Matter) (England) Regulations 2022, Paragraph 4: Siting criteria


(1) Monitoring stations must be sited in accordance with the criteria in sub-paragraphs (2) to (4).
(2) Monitoring stations must be sited to avoid measuring PM2.5 levels within very small micro-environments in their immediate vicinity.
(3) Monitoring stations at near-source sites, as a group, must include stations which are sited to provide data that are representative of locations where the highest PM2.5 concentrations are likely to occur to which the population is exposed for significant periods.
(4) Monitoring stations at near-source sites where the main nearby source of pollution is traffic emissions from a road must be—
(a) not more than 10 metres from the kerbside of the road;
(b) not less than 25 metres from the edge of any junction which interrupts the traffic flow and causes different levels of vehicular PM2.5 emissions from the rest of the road; and
(c) representative of PM2.5 levels in a length of the road of not less than 100 metres.

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Source: https://www.legislation.gov.uk/ukdsi/2022/9780348242959/schedule/2/paragraph/4 (the official version)
Page: https://openlegislation.uk/draft-environmental-targets-fine-particulate-matter-england-regulations-2022/schedule-2/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.