English: Salt Lake City days in Air Quality Index (AQI) categories for the years 2000–2018. Data from Utah's Utah DEQ data archive (http://airmonitoring.utah.gov/dataarchive/archall.htm, accessed Nov 23, 2019). AQI categories of "Unhealthy", "Very Unhealthy", and "Hazardous" are added together, and "Unhealthy" represents over 95% of the combined group.
In case of years with days missing, all groups are scaled up to get an equivalent number of days.
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