Average annual PM2.5 concentrations in the United States 2000-2022, by region

Published by Ian Tiseo, Jan 23, 2024

The West United States recorded the highest average concentration of particle pollution (PM2.5) in 2022, at 9.4 micrograms per cubic meter (µg/m3). This was slightly above the national average concentration of PM2.5 pollution that year, and almost double the World Health Organization guideline of five µg/m3.

Regional trends in average fine particulate matter (PM2.5) pollution levels in the United States from 2000 to 2022 (in micrograms per cubic meter)

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Release date

November 2023

Region

United States

Survey time period

2000 to 2022

Special properties

Seasonally-weighted annual average.

Supplementary notes

Ohio Valley - 59 monitoring sites; Upper Midwest -  38 monitoring sites; Northeast - 73 monitoring sites; Northwest - 10 monitoring sites; South - 30 monitoring sites; Southeast - 63 monitoring sites; Southwest - 19 monitoring sites; West - 46 monitoring sites; Northern Rockies and Plains - 14 monitoring sites.

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