• EPA will not use the sensor data on the map to make regulatory decisions.
• Mention of trade names or commercial products does not constitute EPA or USFS endorsement or recommendation for use. 
• Data may be delayed, unavailable, or in error due to measurement problems, data transmission issues, and/or data aggregation system timing and issues. 
• For the Fire and Smoke Map, low-cost sensor data is provided by PurpleAir and is subject to the capabilities and limitations of that system. 
• For the Fire and Smoke Map, the sensor data has been corrected. It should be used for informational purposes only. 
• Use of any data provider or system does not constitute endorsement or recommendation of that system. The data are being provided for informational purposes and are released on the condition that neither the EPA, USFS, nor the U.S. Government may be held liable for any damages resulting from authorized or unauthorized use of the information. 
• Both the satellite fire detections and the smoke plume data generated by the National Oceanic and Atmospheric Administration’s Hazard Mapping System (HMS) systems which notes that "The information on fire position should be used as general guidance and for strategic planning. Tactical decisions, such as the activation of a response to fight these fires and evacuation efforts, should not be made without other information to corroborate the fire's existence and location."

AirNow Fire and Smoke Map Information Home Page