Before the pandemic, the UK had made limited progress in improving air quality, with less than a quarter of air quality assessment areas meeting the annual mean limit for nitrogen dioxide (NO2). Lockdown restrictions from March 2020 led to less traffic and changing travel patterns and many people experienced better air quality. But by September 2020, most towns and cities saw a return to pre-lockdown levels of air pollution. However, the temporary improvement in air quality in the spring does not mask the need for faster progress on air pollution. Longer term changes to how people live, work and travel as a result of the pandemic will bring opportunities, but also risks, and will require changes to policy which we discuss in the following chapters.