Average annual PM2.5 air pollution concentrations in the United States 2000-2022
The average annual concentration of particulate matter (PM2.5) pollution in the United States stood at 7.8 micrograms per cubic meter (µg/m3) in 2022. This was slightly above the World Health Organization guideline of five µg/m3. Since 2000, there has been a 42 percent decrease in average annual PM2.5 concentrations.