- What are CO standards?
- How are the standards developed and reviewed?
- What scientific and technical information supports reviews?
- See NAAQS for CO for an in-depth explanation of the current CO standards, including Federal Register citations and fact sheets.
The Clean Air Act requires EPA to set national ambient air quality standards for carbon monoxide as one of the six criteria pollutants. The law also requires EPA to periodically review the standards and revise them if appropriate to ensure that they provide the requisite amount of health and environmental protection and to update those standards as necessary.
- Learn more about the standards review process
- View a timeline of the CO NAAQS to get an overview of how the standards have changed over time
The various documents published during the review process include multiple drafts of plans and assessments, reports from the Clean Air Scientific Advisory Committee (CASAC), and Federal Register notices.