Annual technical reports from the UK Eutrophying and Acidifying Atmospheric Pollutants (UKEAP) Network, part of the UK's air pollution monitoring regime.
Source
https://www.gov.uk/government/publications/uk-eutrophying-and-acidifying-atmospheric-pollutants-ukeap-network-technical-reportsCanonical document at the regulator. Always cite this URL — not the Vantage detail page — in compliance evidence.