Carbon monoxide emissions from highway vehicles in the United States totaled ** million tons in 2023.
The U.S. has cut transportation-related CO emissions significantly over the past three decades due to increasingly stringent emissions standards.
Transportation is a major source of CO, and in 2023 accounted for nearly ** percent of CO emissions in the U.S. (excluding wildfires).
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Environmental Protection Agency. (February 9, 2024). Carbon monoxide emissions from transportation in the United States from 1990 to 2023, by source (in 1,000 tons) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 24, 2026, from /statistics/999680/us-carbon-monoxide-emissions-from-storage-and-transport/
Environmental Protection Agency. "Carbon monoxide emissions from transportation in the United States from 1990 to 2023, by source (in 1,000 tons)." Chart. February 9, 2024. ÌÇÐÄÆƽâ°æ. Accessed July 24, 2026. /statistics/999680/us-carbon-monoxide-emissions-from-storage-and-transport/
Environmental Protection Agency. (2024). Carbon monoxide emissions from transportation in the United States from 1990 to 2023, by source (in 1,000 tons). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 24, 2026. /statistics/999680/us-carbon-monoxide-emissions-from-storage-and-transport/
Environmental Protection Agency. "Carbon Monoxide Emissions from Transportation in The United States from 1990 to 2023, by Source (in 1,000 Tons)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 9 Feb 2024, /statistics/999680/us-carbon-monoxide-emissions-from-storage-and-transport/
Environmental Protection Agency, Carbon monoxide emissions from transportation in the United States from 1990 to 2023, by source (in 1,000 tons) ÌÇÐÄÆƽâ°æ, /statistics/999680/us-carbon-monoxide-emissions-from-storage-and-transport/ (last visited July 24, 2026)
Carbon monoxide emissions from transportation in the United States from 1990 to 2023, by source (in 1,000 tons) [Graph], Environmental Protection Agency, February 9, 2024. [Online]. Available: /statistics/999680/us-carbon-monoxide-emissions-from-storage-and-transport/
