August 24, 2026

Contact:
media@ph.lacounty.gov
(626) 430-5360

Ozone Advisory

According to the South Coast Air Quality Management District (AQMD), a multi-day high ozone (smog) event is expected to affect some Los Angeles County regions due to a heatwave. Air Quality Index (AQI) may reach “Unhealthy” levels or higher in Santa Clarita Valley and portions of the San Gabriel Valley and “Unhealthy for Sensitive Groups” or higher levels in San Fernando Valley and Pasadena through Friday evening.

The advisory will be in effect starting on Monday, August 24 at 1 p.m. until Friday, August 28 at 8 p.m. Everyone should monitor local Air Quality Index (AQI) updates during this period.

The following recommendations will help you protect yourself and your family from harmful effects of bad air quality:

• Avoid vigorous physical activity and remain indoors with doors and windows closed.
• Check air quality levels and limit outdoor activities as necessary. See health recommendations for each AQI level.
• Limit the use of gasoline powered lawn and garden equipment until evening hours.
• Conserve electricity and set your air conditioner at a higher temperature.
• Try to delay trips to the gas station and the use of household chemicals until the evening.
• If it’s too hot to keep windows and doors closed, go to a public place like a library or shopping center to stay cool and protect yourself from harmful air.
• If you experience symptoms like severe coughing, shortness of breath, wheezing, chest pain, palpitations, nausea, or unusual fatigue, contact your doctor or go to urgent care. For life-threatening symptoms, call 911.

For more information, see the EPA Guide for Ozone Pollution (PDF).

To stay updated with real-time/forecasted Air Quality in your area, download the South Coast AQMD Mobile App: https://www.aqmd.gov/mobileapp (Also available in Spanish!) or visit https://www.aqmd.gov/home/air-quality/air-quality-forecasts.