# The Environmental Targets (Fine Particulate Matter) (England) Regulations 2022, Paragraph 2: Annual calculations


The following are to be calculated for each year from 2023 onwards (“year n”), by 15th July in the following year—
(a) the Population Exposure Indicator for year n;
(b) the Reference Indicator for year n;
(c) Δ for year n;
(d) the sum of Δ for each of the years beginning with 2019 up to and including year n (“Δsum”);
(e) the cumulative total of the annual changes to the Population Exposure Indicator from the baseline period up to and including year n, expressed as a percentage of PEIbase, as determined by the calculation—
∆sumPEIbase×100

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Source: https://www.legislation.gov.uk/ukdsi/2022/9780348242959/schedule/1/paragraph/2 (the official version)
Page: https://openlegislation.uk/draft-environmental-targets-fine-particulate-matter-england-regulations-2022/schedule-1/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.