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What does the PurpleAir map show?

Oxford Friends of the Earth is a thriving and effective local group that has been active for over 40 years. Our purpose is to work together to promote a healthy and sustainable environment

  • The Purple Air map shows continuous PM2.5 emission levels at different locations in Oxford.
  • It also shows conversions of these levels into various Air Quality Indices. For example, the US EPA associates a level of 17.5 with an index value of 50 and a level of 35 with an AQI of 100.
  • By clicking on each data point, one can also obtain readings of temperature, relative humidity and other characteristics at each location.
  • Historical data plots can be obtained for various time intervals, hourly, daily, weekly and longer.