# Air Quality Index (AQI) - Used in the [[United States]] to measure [[air quality]] - 1–500 scale - Standards-based [^1] - Considers both environmental and human health concerns [^1] - Based on a specific level of individual air pollutant [^1] [^1]: [Canada.com – Difference between Air Quality Health Index and Air Quality Index - date modified 2016-03-22](https://www.canada.ca/en/environment-climate-change/services/air-quality-health-index/difference.html)