Is the air quality good in Southern California?
As of October 16, 2025, air quality across Southern California remains poor, with some areas experiencing “unhealthy” AQI levels and elevated PM2.5 concentrations. These conditions pose health risks, particularly to children, the elderly, and individuals with respiratory or heart conditions.
Several monitoring stations have recorded AQI readings above 150, triggering health advisories. Residents are urged to limit outdoor activities, keep windows closed, wear masks when outdoors, and use indoor air purifiers when possible.
Air quality map of Southern California on Oct 26, 2025. Source IQAir.
Which cities are affected by bad air quality in Southern California?
As of October 26, 2025, cities in California affected by bad air quality include:
For a more detailed look, see California air quality map.
When will the air quality improve in Southern California?
Short-term improvements depend on weather. However, the mix of urban pollution, wildfire smoke, and stagnant weather means that conditions may remain elevated and fluctuate before returning to “good” levels. Residents should stay updated and prepare for variable air quality.
What is causing poor air quality in Southern California?
Poor air quality in Southern California is driven by a combination of wildfire smoke from major 2025 fire events, vehicular and industrial emissions from heavy traffic, ports, and manufacturing zones, and stagnant weather conditions (1).
High-pressure systems, temperature inversions, and weak winds trap pollutants close to the ground, while high humidity levels further reduce air dispersion. These factors—exacerbated by climate change—have contributed to elevated PM2.5 concentrations and widespread unhealthy air across the region (2).
How can I protect myself from poor air quality?