UK air pollution improved between 2015 and 2024, but is still dangerous too often, research from the University of Reading says in ‘Environmental Science: Atmospheres’. Scientists from the University studied pollution at more than 500 monitoring sites around the UK. They found that two types of pollution got better over the decade: nitrogen dioxide (NO2), which is mainly produced by traffic, fell by 35% on average at monitoring sites; and fine particles called PM2.5, which are small enough to get deep into lungs, dropped by 30%.