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

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 in (a) England and (b) Liverpool since 2010.

Defra carries out an assessment of annual mean concentrations of nitrogen dioxide (NO₂) across the UK each year using an air quality model; the full results are published here.

Since 2010, average modelled NO₂ concentrations have decreased in both England and Liverpool; the average annual mean roadside NO₂ concentration in England in 2019 was 28µgm^-3, down from 42µgm^-3 in 2010.

Air quality measurement data from Defra’s long-term Automatic Urban and Rural Network also illustrates the decrease in average NO₂ concentrations across the UK since 2010. The average annual mean NO₂ concentration measured at roadside AURN sites across the UK decreased from 46µgm^-3 in 2010 to 31µgm^-3 in 2019 and 23µgm^-3 in 2020.