The purpose of the Air Quality Index (AQI) used in wildfire air quality forecast is to help you understand what local air quality means to your health.
The AQI is divided into six categories:
The AirNow website is a multi-agency web site run by EPA that reports air quality using the AQI based upon fixed air district monitoring stations. The AQI for PM on this website is a daily (midnight to midnight) 24-hour average, so
hourly reporting requires a methodology call the NowCast
to estimate the 24-hour AQI for each hour. The reported hourly value is what AirNow calls "current air quality."
During wildfires, the NCUAQMD accesses air quality information (Particulate Matter - PM2.5) from both its existing regional air monitoring stations (that report to AirNow), in addition
to portable wildfire PM2.5 air monitors (EBAMs) that have been deployed as appropriate by the District, the USFS, and CARB. The AQI forecasts that the NCUAQMD and the USFS Air Resource Advisors (ARAs) issue during
wildfires (PSA, Advisories, and Alerts), are more accurate AQI forecasts for cities and regions than simply the AQI derived by AirNow that is based upon only a few fixed station monitors that are perhaps not representative
of your city or neighborhood.
Current Information for All 3 Zones
PERMISSIVE BURN DAY?
Today: Thursday July 2nd
For burn day status call
Did You Know?
Pre-1990 trucks can emit two and a half times as much NOx and five times as much particulates as trucks meeting the current on-road heavy-duty engine exhaust emission standards.