Question to the Department for Environment, Food and Rural Affairs:

To ask the Secretary of State for Environment, Food and Rural Affairs, what the primary source of NOx is in the UK.

The latest estimates made of annual pollutant emissions in the UK show that road transport accounts for 32% of NO_x emissions, followed by emissions from energy generation (21%) and emissions from manufacturing and construction (17%).

Further information on the UK’s air pollutant emissions can be found on the National Atmospheric Emissions Inventory website: https://naei.beis.gov.uk/.

Information is also reported in the UK emissions statistical release:

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/778483/Emissions_of_air_pollutants_1990_2017.pdf.