Nitrogen Oxides

Department for Environment, Food and Rural Affairs written question – answered on 9th June 2022.

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Photo of Ian Byrne Ian Byrne Labour, Liverpool, West Derby

To ask the Secretary of State for Environment, Food and Rural Affairs, what estimate he has made of the change in levels of nitrogen oxide levels in ((a) Liverpool and (b) England from March 2019 to March 2022.

Photo of Jo Churchill Jo Churchill The Parliamentary Under-Secretary of State for Environment, Food and Rural Affairs

Assessments of concentration changes are reported in:

i) National Statistics on Air Quality are available here: ii) The statutory compliance assessments, "Air Pollution in the UK" 2019 and 2020 (published in September 2020 and 2021 respectively) are available here:

Concentration data for 2022 has not yet been quality assured and remains provisional. It is available in UK-Air here:

Our national statistics (published in April) are compiled on an annual basis and data for the year 2022 will be published in April 2023 following data ratification. The formal compliance assessment for 2021 will be published in "Air Pollution in the UK" this September once concentration modelling has been completed. Compliance for 2022 calendar year will be publication in September 2023.

Our National Monitoring Network (the Automatic Urban and Rural Monitoring Network (AURN)) measured a 20% decline in annual mean concentrations of nitrogen dioxide across roadside sites in the UK between the periods 2019 to 2021, and a 19% decline at urban background sites. There were two AURN sites in Liverpool throughout this period, Birkenhead Borough Road and Wirral Tranmere. Current data shows a declining trend in concentrations at both of these sites since March 2019.

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