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Why PurpleAir monitors?

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

  • We chose PurpleAir monitors because recent research comparing 44 small-scale sensors found PurpleAir (PA-II) data had the highest comparability with the expensive official air quality monitors typically used by City Councils.
  • There are now a considerable number of co-location studies confirming the usefulness of the Purple Air measurement system (compared with other low cost monitors). References are available on request.