Fire and smoke map

With the rush of wildfires in California, governor Gavin Newsom declared (another) state of emergency. The Fire and Smoke Map from the U.S. Forest Service and Environmental Protection Agency provides a picture of where we’re currently at. The map incorporates data from a variety of sensors across the country:

The sensor data comes from PurpleAir, which crowdsources data from that company’s particle pollution sensors and shows the data on a map. Before the sensor data appear on the AirNow Fire and Smoke Map, EPA and USFS apply both a scientific correction equation to mitigate bias in the sensor data, and the NowCast, the algorithm to show the data in the context of the Air Quality Index.