w8emv, Reading air quality stats. It appears to be that you should look at at least 3 web sites to get a complete picture of Ann Arbor.
- EPA "Airnow" https://www.airnow.gov/?city=Ann%20Arbor&state=MI&country=USA
- PurpleAir (a sensor you can buy) https://map.purpleair.com/1/mAQI/a10/p604800/cC0#11.7/42.2711/-83.6723
- City of Ann Arbor "Air Quality in Ann Arbor" https://analytics.a2gov.org/superset/dashboard/air-quality/?native_filters_key=9uwMAONEJI-UjZnKHAy0dDKl8sMVgd7EukpgbU91M1aWPB-xVURwXR8WzlAfuUgV
The EPA sensors aren't everywhere; the PurpleAir sensors are mostly in affluent areas; and several of the City of Ann Arbor sensors are offline.
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