epa10576631 A sign denotes the Ultra Low Emission Zone (ULEZ) in London, Britain 17 April 2023. The aim of the ULEZ is to improve air quality by reducing the number of vehicles in London that don't meet emissions standards. According to a report from from Imperial College London's Environmental Research Group, air pollution causes harm to people at all stages of life, including reducing sperm count and damaging fetal growth. Particulate matter (PM2.5) and nitrogen dioxide (NO2) are particularly harmful, both of which come from vehicle exhausts. EPA/NEIL HALL
