About US Air Quality
US Air Quality provides free, accessible air quality information for cities across the United States. We aggregate official government data to help you understand local air quality conditions and make informed decisions to protect your health.
Our Data Sources
We don't create air quality data — we aggregate and present official data from trusted government sources:
EPA AirNow
Our primary data source. AirNow is operated by the U.S. Environmental Protection Agency (EPA) in partnership with state and local air quality agencies. It provides official Air Quality Index (AQI) values, pollutant measurements, and forecasts.
Visit AirNow.gov →EPA Air Quality System (AQS)
Historical air quality data and long-term trends from the EPA's official monitoring network. This data helps us show how air quality has changed over time in different regions.
EPA Air Quality Data →Health Guidelines
Our health recommendations are based on official EPA guidance and the standardized Air Quality Index (AQI) developed by the EPA. We don't provide medical advice — we present the EPA's health guidance for different AQI levels.
Learn about AQI →Our Methodology
How We Present Data
- We pull real-time AQI data directly from the EPA's AirNow API
- Data is refreshed hourly to match EPA update schedules
- We display the primary pollutant and overall AQI for each location
- Historical data comes from EPA's Air Quality System database
What We Add
- Easy-to-understand city pages with local context
- Comparison tools to compare air quality between cities
- Educational content explaining what different pollutants mean
- EPA's official health guidance presented in accessible format
What We Don't Do
- We don't create or modify air quality measurements
- We don't provide medical diagnoses or treatment advice
- We don't make health claims beyond official EPA guidance
Who We Are
US Air Quality is an independent informational website. We're not affiliated with the EPA, AirNow, or any government agency. We built this site because we believe everyone deserves easy access to air quality information that affects their daily health decisions.
Our role is to make official government data more accessible and easier to understand — not to replace it. For the most authoritative information, we always recommend visiting AirNow.gov directly.
Health Information Disclaimer
This website provides general information about air quality based on EPA data and guidance. It is not intended as medical advice. If you have respiratory conditions, heart disease, or other health concerns, please consult with a healthcare provider for personalized guidance on how air quality may affect you.
Editorial Policy
Accuracy: We strive to present EPA data accurately. If you notice any errors, please contact us.
Updates: Real-time data is updated hourly. Educational content is reviewed periodically to ensure it reflects current EPA guidelines.
Independence: We don't accept payment to feature specific content or modify data presentation. Any affiliate relationships are clearly disclosed.
Corrections: If we make an error, we'll correct it promptly and note the correction on the affected page.
Contact Us
Have questions, found an error, or want to provide feedback? We'd love to hear from you.
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