ppm = parts per million; ppb = parts per billion; μg/m3 = micrograms per cubic meter.Â
*Primary standards provide public health protection, including protecting the health of "sensitive" populations such as asthmatics, children, and the elderly.Â
Citation formats
Air quality standards in the U.S. 2024, by pollutant
The U.S. Environmental Protection Agency is required to set National Ambient Air Quality Standards (NAAQS) for *** principal air pollutants to provide public health protection. The current annual standard for fine particulate matter (PM2.5) is **** micrograms per cubic meter (μg/m3). Once inhaled, PM2.5 can lead to various health issues in humans, including heart disease, lung cancer, and premature mortality. The current annual U.S. guidelines for PM2.5 are almost twice the levels recommended by the World Health Organization.
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Environmental Protection Agency. (December 16, 2024). The National Ambient Air Quality Standards (NAAQS) in the United States as of 2024, by pollutant [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 25, 2026, from /statistics/1446041/air-quality-standards-by-pollutant-us/
Environmental Protection Agency. "The National Ambient Air Quality Standards (NAAQS) in the United States as of 2024, by pollutant." Chart. December 16, 2024. ÌÇÐÄÆƽâ°æ. Accessed July 25, 2026. /statistics/1446041/air-quality-standards-by-pollutant-us/
Environmental Protection Agency. (2024). The National Ambient Air Quality Standards (NAAQS) in the United States as of 2024, by pollutant. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 25, 2026. /statistics/1446041/air-quality-standards-by-pollutant-us/
Environmental Protection Agency. "The National Ambient Air Quality Standards (Naaqs) in The United States as of 2024, by Pollutant." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 16 Dec 2024, /statistics/1446041/air-quality-standards-by-pollutant-us/
Environmental Protection Agency, The National Ambient Air Quality Standards (NAAQS) in the United States as of 2024, by pollutant ÌÇÐÄÆƽâ°æ, /statistics/1446041/air-quality-standards-by-pollutant-us/ (last visited July 25, 2026)
The National Ambient Air Quality Standards (NAAQS) in the United States as of 2024, by pollutant [Graph], Environmental Protection Agency, December 16, 2024. [Online]. Available: /statistics/1446041/air-quality-standards-by-pollutant-us/
