- Download Data Files
Pre-generated files of data for the entire nation. Files of our most commonly requested parameters at the annual, daily, and hourly summary levels.
- Download Daily Data
Query daily summary concentrations and Air Quality Index values by criteria pollutants, year, county/CBSA/monitor. Best tool for getting daily data by monitoring site for a single year and a small geographic region.
- Download Raw Data
Query raw data for a specific location and time for any pollutant.