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Wildfires Continue To Impact Valley Air Quality

The Rogers Fire in Tuolumne County, the Red Fire in Mariposa County and the Mosquito Fire in Placer County are causing smoke impacts across the San Joaquin Valley with higher levels seen in the northern region of the Valley. As a result, the District has issued an Air Quality Advisory to remain in place while smoke impacts continue, or until this weekend when a trough is expected to begin to pass through the region and assist with dispersion. The District warns residents being impacted by smoke to remain indoors to reduce their exposure to particulate matter (PM) emissions.

Particulate matter can trigger asthma attacks, aggravate chronic bronchitis, and increase the risk of heart attack and stroke. Individuals with heart or lung disease should follow their doctors’ advice for dealing with episodes of PM exposure. Those with existing respiratory conditions, including COVID-19, young children and the elderly, are especially susceptible to the health effects from this form of pollution. Anyone experiencing poor air quality due to wildfire smoke should move to a filtered, air-conditioned environment with windows closed. Common cloth and paper masks being used as protection from COVID-19 may not be sufficient protection from wildfire smoke inhalation.

For details on current and past wildfires affecting the Valley, as well as resources to protect yourself from exposure to wildfires smoke, visit the District’s Wildfire Information page at In addition, you can access RAAN to check air quality at any Valley location at, view the EPA AirNow Fire and Smoke map ( and find links to temporary foothill monitors.

For more information, visit or call a District office in Fresno (559-230-6000), Modesto (209-557-6400) or Bakersfield (661-392-5500).