"California’s clean-air agency voted on Friday to push ahead with stricter emissions standards for cars and trucks, setting up a potential legal battle with the Trump administration over the state’s plan to reduce planet-warming gases."

"California's air quality board voted unanimously on Thursday to approve methane regulations touted as the strictest adopted yet in the United States for controlling emissions of the second-most prevalent greenhouse gas in the atmosphere."

"No agency in the federal government fared worse under Thursday’s proposed budget than the Environmental Protection Agency."

"U.S. Senate Minority Leader Chuck Schumer and 11 other Democrats said on Tuesday it was "critical" that the Trump administration leave in place new vehicle fuel efficiency rules, saying the higher standards were achievable."

"A pregnant woman's exposure to air pollution has adverse effects on her fetus, according to a new international study, with prolonged exposure associated with nearly 1 in 5 premature births globally."

"When nearly 200 countries agreed last October to dramatically reduce their reliance on climate change-polluting chemicals called hydrofluorocarbons (HFCs) in air conditioning and refrigeration, the hunt for alternatives was already underway. Now, a new study in the journal Nature Communications that comprehensively explored pure liquid options found only 27 candidates, and problems with all of them."

"President Trump has vowed to roll back regulations on business, and automakers are wasting no time in pushing his administration to make good on the promise."

"Dusty mounds of petroleum coke are gone from Chicago, but federal and city officials discovered a potentially more dangerous type of pollution while investigating the black piles that once towered above the East Side neighborhood."

"A 2015 explosion at the company's refinery near Los Angeles came frighteningly close to releasing a lethal gas into a neighborhood; a ban may result".

"China's smog-hit capital Beijing plans to slash coal consumption by a further 30 percent in 2017 as part of its efforts to combat air pollution, the official Xinhua news agency said late on Sunday, citing the city's mayor."