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Outdoor Air Quality Data

Air Data - Daily Air Quality Tracker (PDF Report)

This report puts multiple AirData outputs on a single page to show:

  • Daily AQI values relative to the 20-year high and low and the average of the last five years
  • Counts of "good" and "bad" AQI days relative to the 20-year high and low and the average of the last five years
  • Distribution of daily AQI values by calendar quarter relative to previous years

More information: The most recent AQI values are based on available ozone and PM2.5 data from AirNow (see "Use of AirNow Data" info box).  The 20-year high/low backdrop is based on AQS data from 2000-2019.  It shows the range of the highest and lowest daily max AQI values on each date.  The 5-year average is based on AQS data from 2015-2019.  It  shows the average of daily max AQI values on each date. The distribution plots fit a normal density function to the data to convey spread and central tendancy in each quarter relative to the same quarter in other years. In the tile plot, each tile represents one day and is color-coded based on the AQI level for that day.


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