LA Air Basin Gets Clean Bill for Tiny Particle Pollution
Published Date: 6/3/2025
Rule
Summary
The EPA says the air in the Los Angeles-South Coast area is clean enough for tiny particle pollution (PM2.5) based on recent data. Because of this, some pollution rules will be paused as long as the air stays clean. Plus, the EPA approved California’s 2018 pollution report, helping keep track of emissions and plan for a healthier future.
Analyzed Economic Effects
2 provisions identified: 2 benefits, 0 costs, 0 mixed.
Clean Data Determination for South Coast
The EPA determined that the Los Angeles–South Coast Air Basin is meeting the 2006 24-hour PM2.5 national ambient air quality standard. Because of this clean data determination, certain Clean Air Act requirements that applied to California will be suspended for so long as the area continues to meet the 2006 24-hour PM2.5 NAAQS.
Approval of 2018 Base Year Emissions Inventory
The EPA approved California’s State Implementation Plan revision consisting of the 2018 base year emissions inventory for the South Coast PM2.5 nonattainment area, which CARB submitted on December 29, 2020. This approval formally incorporates the 2018 emissions inventory for the South Coast into the SIP.
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