A new air quality alert has been issued in California as windblown dust pushes pollution levels higher in the Imperial Valley.
- Officials warned Saturday that conditions could become harmful, prompting calls to reduce travel and limit emissions.
- Residents and visitors are being urged to cut back on driving, avoid outdoor exertion and take precautions as air quality worsens.
Why It Matters
Dust-driven pollution is a recurring issue in parts of Southern California, particularly in desert regions where strong winds can quickly degrade air quality.
With elevated particle levels expected, public health officials are warning that even short-term exposure can pose risks, especially for vulnerable groups.
What To Know
An air quality alert has been issued for the Imperial Valley due to harmful levels of particle pollution caused by windblown dust, according to the National Weather Service (NWS).
The alert is set to run from noon to midnight on Saturday, May 16, covering communities including El Centro, Calexico, Brawley and surrounding areas in Imperial County.
Officials said pollution levels can vary depending on local weather conditions. Still, they warned that dust driven into the air by strong winds could push air quality into unhealthy ranges at times.
Health authorities cautioned that particle pollution can penetrate deep into the lungs and trigger serious issues, including asthma attacks and heart and lung symptoms.
While anyone can be affected, people with existing health conditions, older adults and those spending long periods outdoors face greater risks.
Residents are being encouraged to check real-time air quality updates and adjust activity levels accordingly.
At higher Air Quality Index levels, guidance becomes more restrictive, ranging from limiting outdoor activity for sensitive groups to avoiding physical activity altogether in the most severe conditions.
To reduce exposure indoors, officials recommend keeping windows and doors closed, using air conditioning or air purifiers and avoiding additional sources of indoor pollution such as candles or gasoline-powered equipment.
Efforts to limit pollution outdoors are also being emphasized. That includes reducing trips, carpooling or using public transportation where possible, as well as driving carefully on dirt roads and stabilizing loose soil to prevent dust from being kicked up.
What AQI Levels Mean For Health
Officials urge residents to visit https://www.aqmd.gov/alertinfo to check current and forecasted air quality levels and adjust their behaviour as conditions worsen.
Guidance is based on the Air Quality Index (AQI), which uses colour‑coded categories to signal rising health risks.
- When AQI reaches “Unhealthy for Sensitive Groups” (orange), vulnerable people are advised to limit prolonged or strenuous outdoor activity
- At “Unhealthy” levels (red), everyone may begin to experience health effects, while sensitive groups should avoid extended time outdoors
- When conditions worsen to “Very Unhealthy” (purple), sensitive groups should avoid all outdoor physical activity, and others should limit exertion
- At the most severe level, “Hazardous” (maroon), officials recommend that everyone avoid all outdoor physical activity
What Happens Next
Additional advisories may be issued depending on weather and dust conditions.
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