Harrisburg earned an F for year-round particle pollution and ranked 37th-worst in the country for that measure.

Over three years, emergency room visits dropped by 61 percent compared with past years.

The new State of the Air report from the American Lung Association finds the Harrisburg area worsened in daily particle pollution for the third straight year.

The groups had sought $42 million for 102-day pollution control outage that sent emissions soaring.

The shredder has been a nuisance for those living nearby, said Angelo Taranto, of Allegheny County Citizens for Clean Air Now, or ACCAN, which has been advocating for the site to be cleaned up for years. 

The Environmental Integrity Project and Clean Air Council sent a notice of intent to sue Thursday to get the company to comply with state and federal air rules.

The monitors are meant to track the amounts of pollutants like ozone, particulate matter, and carbon monoxide in the air. 

Researchers at the University of Pennsylvania say heavy industry could adopt strategies to cut emissions and capture carbon.

Even moderate amounts of air pollution increase the number of children going to emergency rooms for asthma in Allegheny County, a new study finds. 

The plaintiffs are asking a judge to find the company guilty of committing over 12,000 violations of the Clean Air Act, and to order US Steel to ensure the plant will never again go without air pollution controls.