"The Environmental Protection Agency said it will delay carbon rules for power plants, missing a deadline set by President Barack Obama in one of the centerpieces of his climate-change agenda."

"CUBA, N.M. — The methane that leaks from 40,000 gas wells near this desert trading post may be colorless and odorless, but it’s not invisible. It can be seen from space."

"A federal appeals court today threw out U.S. EPA's decision to extend a compliance deadline for its ozone air standard, as well as the agency's revoking a stringency requirement for transportation projects."

"Air pollution should be one of the avoidable heart risk factors - just like smoking and excess fat - that doctors warn patients to steer clear of, according to a new statement from 20 heart experts."

"Women who are exposed to high levels of air pollution during their third trimester of pregnancy may be twice as likely to have an autistic child, a study found."

"The Obama administration as soon as Wednesday will announce its plans for curbing methane emissions from the oil and gas sector, which the United States must do to meet its 2020 target for cutting greenhouse gas emissions, people familiar with the issue said Tuesday."

"The scientific case has been building for how a smoggy summer afternoon in North Texas might harm a child playing outdoors, a person with asthma or, on the worst days, perhaps even a healthy adult."

"President Obama could leave office with the most aggressive, far-reaching environmental legacy of any occupant of the White House. Yet it is very possible that not a single major environmental law will have passed during his two terms in Washington."

"The U.S. Supreme Court on Tuesday agreed to weigh a challenge by industry groups and some states to an Obama administration regulation intended to limit emissions of mercury and other hazardous pollutants mainly from coal-fired power plants."

"The Obama administration is expected to release on Wednesday a contentious and long-delayed environmental regulation to curb emissions of ozone, a smog-causing pollutant linked to asthma, heart disease and premature death."