Data about the daily mean concentration of air pollutants, especially those potentially harmful to human health. Data should be available for all air monitoring stations or air monitoring zones in a country. The Index focusses on key pollutants as defined by the World Health Organisation. See our methodology section for more information.
| Data location | https://www.epa.gov/outdoor-air-quality-data - Air Quality Data Collected at Outdoor Monitors Across the US | 
| Data licence | https://www.copyright.gov/title17/92chap1.html#105 | 
| Data format | CSV | 
| Reviewer | Ricardo Alanís | 
| Submitters | anonymous | 
| Last modified | Mon Feb 27 2017 15:42:39 GMT+0000 (UTC) | 
Accepted without corrections.