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Los Angeles Times
L.A. starts year with worst smog in a decade
The first five months of 2026 have been the smoggiest in Southern California in over a decade, with 39 days exceeding federal ozone standards, surpassing previous years like 2017. This surge in smog levels, driven by early heat waves and high temperatures, has affected about 18 million residents, especially in valleys, causing increased respiratory issues. Despite decades of regulation to reduce pollution, the region continues to struggle with meeting federal air quality standards due to ongoing emissions from vehicles and favorable environmental conditions for smog formation. Experts emphasize the need for further action to control pollution and protect public health.
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