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 191

Ozone Ground-Level Ozone Air Pollution Clean Air Act 191

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 206

Fossil Fuels Carbon Emissions Nitrogen Oxides Clean Air Act 206

Union of Concerned Scientists

OCTOBER 4, 2023

EPA , and Congress finalized the Energy Independence and Security Act of 2007 , requiring increasing fuel economy standards. As such, under the Clean Air Act EPA has a strong incentive to push the market to adopt advanced technologies like electric vehicles , which can eliminate tailpipe pollution entirely.

Electricity 238

Electricity Clean Air Act Carbon Dioxide 2027 238