Air quality in the United States based on common air pollutants has improved considerably over the past two decades. In 2023, annual concentrations of nitrogen dioxide were more than ** percent below 2000 levels, while carbon monoxide concentrations were almost ** percent lower.
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Environmental Protection Agency. (January 8, 2025). Percentage change in air quality in the United States from 2000 to 2023, by pollutant [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 14, 2026, from /statistics/1445931/change-in-air-quality-in-the-us/
Environmental Protection Agency. "Percentage change in air quality in the United States from 2000 to 2023, by pollutant." Chart. January 8, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 14, 2026. /statistics/1445931/change-in-air-quality-in-the-us/
Environmental Protection Agency. (2025). Percentage change in air quality in the United States from 2000 to 2023, by pollutant. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 14, 2026. /statistics/1445931/change-in-air-quality-in-the-us/
Environmental Protection Agency. "Percentage Change in Air Quality in The United States from 2000 to 2023, by Pollutant." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 8 Jan 2025, /statistics/1445931/change-in-air-quality-in-the-us/
Environmental Protection Agency, Percentage change in air quality in the United States from 2000 to 2023, by pollutant ÌÇÐÄÆƽâ°æ, /statistics/1445931/change-in-air-quality-in-the-us/ (last visited July 14, 2026)
Percentage change in air quality in the United States from 2000 to 2023, by pollutant [Graph], Environmental Protection Agency, January 8, 2025. [Online]. Available: /statistics/1445931/change-in-air-quality-in-the-us/
