Emissions of nitrogen oxides from road transport in the UK 1990-2021
Emissions of nitrogen oxides (NOx) as NO2 from road transportation in the United Kingdom were approximately 185,000 metric tons in 2021. Although this was an increase compared to 2020, emissions were still considerably lower than in previous years. Road transportation is the main source of nitrogen oxides emissions in the UK. Nitrogen oxides are a group of highly reactive gases including nitrogen dioxide (NO2) and nitrous oxide (N2O).
