"When the Environmental Protection Agency this week proposed repealing tighter emissions standards for a type of freight trucks, it cited research conducted by Tennessee Tech University but underwritten by the biggest truck manufacturer challenging the rule."

"The Environmental Protection Agency proposed a rule Thursday to repeal tighter emissions standards for heavy-duty trucks with older engines, an Obama-era regulation aimed at controlling soot and other pollutants along with greenhouse-gas emissions linked to climate change."

"DETROIT — Dozens of demonstrators gathered Thursday at the Marathon Petroleum refinery in a bid to convince the company to relocate all who want to relocate over concerns about pollution."

"The U.S. Senate voted on Thursday 49-47 to confirm a top air quality official at the Environmental Protection Agency, despite concerns raised by lawmakers over his industry ties."

"Besides lead, no contaminant in drinking water has provoked as loud a public outcry in the last two years in the United States as a class of chemicals known as perfluorinated compounds. New Jersey regulators are taking the strongest action to date on the man-made chemicals that are used in scores of household and industrial products."

"U.S. EPA Administrator Scott Pruitt is again signaling his determination to slow-walk key compliance decisions for the agency's 2015 ground-level ozone standard, raising the odds that only a prolonged court battle will settle the issue."

"California’s top water regulators adopted an agreement that commits the state to following through on plans of building wetlands and controlling dust around the shrinking Salton Sea over the next 10 years."

"The Menominee Indian Tribe of Wisconsin gave the feds notice of intent to sue over the alleged failure to protect the water quality of the tribe's namesake river."

"The Environmental Protection Agency (EPA) won’t yet say which areas of the country do not meet the Obama administration’s 2015 regulation on ozone."

"Robert Phalen, an air pollution researcher just named to a key U.S. EPA advisory committee, is defending earlier comments that the air can be 'a little too clean' for children's health as grounded in the broader field of pulmonary medicine."