Terms of use

Air Quality Watch (airqualitywatch.org) is a free guide to air quality in the United States, published by InfoBakery. These terms apply when you use the site.

Effective November 12, 2026.

Emergencies and health

In an emergency, call 911. Follow instructions from public health and emergency officials. Air Quality Watch sends no alerts and does not replace official warnings from the National Weather Service or your state and local agencies.

Nothing on the site is medical, legal or other professional advice. For questions about your own health, talk to a health professional.

General information from public sources

• The site shows public data from the U.S. EPA AirNow program and its partner agencies, the National Weather Service and EPA AirData. Current readings are preliminary and can change after quality checks.
• Data can be delayed, incomplete or wrong, and coverage varies from place to place. A missing reading means no reading was available.
• For official readings, visit AirNow.gov; for official alerts, visit weather.gov.

No warranty, limited liability

The site is provided as is and as available. To the extent the law allows, InfoBakery makes no promise that it is accurate, complete, current or always available, and is not liable for any loss or damage that comes from using the site or relying on it.

Using the site fairly

• Do not interfere with the site: no attacks, no attempts to get around its security, and no traffic heavy enough to slow it down for others.
• Automated access must be reasonable. For current data, use the agencies' own services; for history, use the JSON files described on Sources and coverage.

Reusing content and data

• The site's own text, design and logo are © InfoBakery.
• Data from U.S. government agencies, such as EPA, the National Weather Service and the Census Bureau, are generally in the public domain. AirNow data should be credited to the U.S. EPA AirNow program and the reporting agencies and labelled preliminary, as AirNow's data exchange guidelines ask.
• Third-party material remains subject to any applicable source licenses. Public-domain material remains in the public domain.
• The base map is © OpenStreetMap contributors, served by OpenFreeMap. County and state outlines come from U.S. Census Bureau files through us-atlas (ISC license).

Names and trademarks

Names of agencies and organizations belong to their owners and are used only to identify who published a record. InfoBakery publishes Air Quality Watch independently of any government agency, and a mention implies no endorsement.

Links to other sites

Links lead to sites we do not control. We are not responsible for their content, availability or terms.

Changes

We may update these terms. The new version applies from the effective date shown on this page. How the site handles information is on the privacy page. Questions about these terms are welcome through the contact form.