What is the best way to access outdoor air monitoring data?
- By Data Type – it depends on what you need.
- Current and forecast data and maps
- Daily summaries of recent and historical data
- Historical - Pre-generated files of Daily Summary Data
- Recent and Historical - AirData Air Quality Index (AQI)-related reports and visualizations
- Annual summaries
- Pre-generated files of Annual Summary Data
- AirData annual summaries of AQI and concentrations
- AirTrends website
- Hourly data
- Current – AirNow.gov
- Historical – Pre-generated files of Hourly Summary Data or the AQS API
- Monthly – no summaries available
- By Access Method
- Pre-generated files – National files of monitor-level data, plus AQI data by city and county, available for download – updated twice annually
- AQS API – row-level data from the EPA's Air Quality System (AQS) database; You can sign up to obtain a key to use the API and perform your own data queries.
- AirData reports and visualizations – daily and annual summaries of AQI and concentrations at city, county, or site level
- Map of monitor locations – daily and annual summaries by monitor
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