View the map from the New York Times.
The map includes active and recent fires reported by the Wildland Fire Interagency Geospatial Services group. The locations of the fires on the map are approximate, derived from data reported by the NASA FIRMS satellite-based fire detection system, which makes observations multiple times a day. Areas marked in red indicate where active burning was detected within 24 hours of the most recent detections reflected on the map. The exact boundary of a fire may differ from the extent shown on the map by 500 meters or more.
Air quality data is derived from PurpleAir sensors. Colored squares show the average levels of particulate matter in the air — PM2.5, or particles that are 2.5 microns are smaller in diameter — where sensor data is available within a 10-mile radius of each square’s position. Readings have been adjusted to account for the properties of wood smoke. The quality levels are based on the Air Quality Index developed by the U.S. Environmental Protection Agency.
Population counts are rounded estimates. Totals are calculated using Global Human Settlements estimates from 2015 from the European Commission’s Joint Research Center.