Record Smog Levels Challenge Southern California

The initial months of 2026 have brought record smog concentrations to Southern California, marking the worst period in over a decade. The South Coast air basin, encompassing Los Angeles, Orange, Riverside, and San Bernardino counties, reported 39 days of excessive lung-irritating ozone levels, surpassing the federal standard. This figure exceeds the notorious air quality of 2017, which had 36 unhealthful air days by early June.

The region’s approximately 18 million residents face heightened risks of asthma and other respiratory ailments due to ozone exposure. Adrian Martinez, director of Earthjustice’s Right to Zero campaign, stressed concerns for this year’s potential record-breaking air pollution. Early heat waves and sustained sunlight have amplified these issues, particularly affecting valley areas.

“If we have this many violations by this time, this could be a really awful year for air quality,” said Adrian Martinez.

South Coast Air Quality Management District attributes the rise in ozone levels to unexpected heat waves, with temperatures reaching the mid-80s and high 90s between January and April. March set new records as California’s warmest, with Riverside experiencing 13 days over 90 degrees.

The district advises the public to stay informed about pollution levels and limit outdoor activities during high-smog conditions. Unlike visible wildfire smoke, ozone is imperceptible to the senses, necessitating caution.

Southern California’s geography and high vehicle emissions catalyze smog formation, compounded by solar activity and trapped by local mountains. Despite progressive regulations over the past decades, such as tailpipe emission standards, the area fails federal ozone standards.

At a meeting in Diamond Bar, air district officials honored the late William Burke, acknowledging his contributions to significant pollution reduction. Residents of the Inland Empire, one of the most affected zones, expressed gratitude but emphasized ongoing concerns about invisible pollutants.

Earthjustice attorney Adrian Martinez called for governmental action to accelerate the transition to zero-emission technologies. He emphasized simplicity in addressing the twin challenges of heat and pollution, urging regulatory bodies to focus on pollution control within their remit.