WASHINGTON DC (April 15, 2020) — On April 14, the US Environmental Protection Agency (EPA) is announcing its proposal to retain, without changes, the National Ambient Air Quality Standards (NAAQS) for particulate matter (PM) including both fine particles (PM2.5) and coarse particles (PM10). This proposal comes after careful review and consideration of the most current available scientific evidence and risk and exposure information, and with consultation and confirmation by th