Union of Concerned Scientists

MAY 17, 2023

If you’ve ever been outside in an urban environment on a hot sunny day and wondered why the air just seemed worse in your lungs—think sore and scratchy throat or difficulty breathing while doing exercise—you have likely experienced some of the health effects associated with ozone pollution.

Ozone 188

Ozone Ground-Level Ozone Air Pollution Clean Air Act 188

Union of Concerned Scientists

JUNE 14, 2023

EN: These standards—or at least something based on the same Clean Air Act provision—have been in the works for a long time. The Clean Power Plan was the culmination of years of legal and technical haggling over EPA authority and obligations, including the landmark Massachusetts v. EPA Supreme Court decision in 2022.

Fossil Fuels 203

Fossil Fuels Carbon Emissions Nitrogen Oxides Clean Air Act 203

Union of Concerned Scientists

OCTOBER 4, 2023

However, with the oil crisis in the rear-view mirror, then-President Ronald Reagan acceded to requests from Ford and General Motors to reduce fuel economy standards for a few years, and the political will to strengthen the program petered out.

Electricity 235

Electricity Clean Air Act Carbon Dioxide 2027 235