Population at risk of unhealthy PM2.5 levels in the U.S. 2019-2021
An estimated 63.7 million Americans are living in places with failing grades (F) for unhealthy daily levels of particle pollution (PM2.5). Nearly 20 million Americans live in counties where year-round particle pollution levels are worse than the national air quality limit, and that receive a failing grade. People who live in areas with high exposure to PM2.5 are at risk of harm to their health.