Statement: In victory for clean air, judge orders EPA to implement protections from soot

WASHINGTON, JULY 18, 2026 — A federal district court ruled last night that the Trump EPA must carry out its responsibility under the Clean Air Act to implement our national protections against fine particulate pollution (PM2.5, or soot). 

“EPA’s own scientists found that implementing the soot standard would save 4,500 lives each year while also preventing hundreds of thousands of asthma attacks and emergency room visits – as well as cases of lung cancer, heart disease, and dementia,” said Environmental Defense Fund attorney Richard Yates. “The court just set a firm deadline for EPA to designate which communities are breathing unsafe air, which is the first step toward cleaning it up. At a time when enormous swaths of the country are sheltering inside under red-alert levels of air pollution, this court order is especially welcome.”

PM2.5 is made of microscopic particles that can lodge deep in the lungs and cause a variety of serious or fatal health problems. EPA strengthened the national health standard for PM2.5 in 2024. 

Under Trump EPA administrator Lee Zeldin, EPA has tried several tactics to weaken protections against soot, including delaying the Tier 4 vehicle pollution standards. It has also already lost another court case after reversing its initial position and arguing that the more protective science-based health standard adopted in 2024 should be vacated. 

The case that was decided yesterday was brought by a coalition of health and environmental organizations, including Environmental Defense Fund, and by a group of states and local governments. 

• It requires that by February 6, 2027, EPA must identify areas of the country that are in violation of the health-based soot standard.
• Under the Clean Air Act, these “area designations” then trigger state clean-up plans for our air.
• The plans use commonsense solutions to reduce soot from sources like coal plant smokestacks, tailpipes and petrochemical facilities.