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Updated:May 21, 2026 5:30 pm PDT

Air Quality Alert AIR QUALITY ALERT  
Ventura County

  Effective: Wed, 5/20 3:59pm Severity: Unknown
  Updated: May 21, 2026 5:30 pm Urgency: Unknown
  Expires: Thu, 5/21 10:00pm Certainty: Unknown

Areas Affected: Eastern San Fernando Valley - Eastern San Gabriel Mountains - Los Angeles County San Gabriel Valley - Santa Clarita Valley - Santa Susana Mountains - Western San Fernando Valley - Western San Gabriel Mountains and Highway 14 Corridor
 
Alert Details:
* WHAT...The South Coast AQMD has issued an air quality alert due to
increased fine particle pollution from wildfire smoke. Visit
https://www.aqmd.gov/alertinfo to check current and forecasted air
quality levels.

* WHERE...in portions of Los Angeles, Riverside, and San Bernardino
Counties. Levels of particle pollution can vary by time and
location depending on fire activity and local weather conditions.

* WHEN...until 10 PM on Thursday.

* IMPACTS...Particles in wildfire smoke can get deep into the lungs
and cause serious health problems such as heart attacks, strokes,
asthma attacks, and difficulty breathing. Everyone can be affected,
but people with lung or heart disease, older adults, people who
are pregnant, children, and those who spend a lot of time outdoors
are at greater risk.

Information:
To protect your health, if you smell or see smoke:

* Remain indoors with windows and doors closed
* Avoid intense outdoor physical activity
* Run your air conditioner and/or an air purifier
* If you must be outdoors, keep the time brief and wear a well-
fitting N-95 mask
* Do not use whole house fans or swamp coolers that bring in
outside air if you have other methods to stay cool
* Avoid other sources of pollution such as fireplaces, candles,
incense, grilling, and gasoline-powered lawn and garden
equipment