Q: What is the PurpleAir map?

A: This map is populated exclusively with data from PurpleAir sensors from the PurpleAir network. Each icon on the map represents a public PurpleAir sensor, and the color indicates the real time PM2.5 reading on the US EPA Air Quality Index scale. The default display shows the US EPA PM2.5 AQI of both outdoor and indoor sensors. You can customize the data displayed and sensor types visible by using the map legend.

When clicking a sensor icon, two informative boxes display. One shows the sensor information and averages over the past week, while the other shows a graphical chart of readings from Channels A and B over the past week.