"Carbon monoxide (CO), nitrogen dioxide (NO2), and particulate matter (PM) are harmful air pollutants that pose significant short- and long-term health risks. Emitted from coal-fired power plants, vehicle exhaust pipes, and other combustion sources, they’re among six primary pollutants monitored by the U.S. Environmental Protection Agency (EPA) through the Clean Air Act. These same pollutants are also some of the most common contributors to unhealthy air inside U.S. homes, due in part to a ubiquitous and possibly surprising activity: cooking."

"Officials from the U.S. Fish and Wildlife Service and U.S. Coast Guard announced Monday they were working to mitigate damage from a spill of crude oil within the Delta National Wildlife Refuge."

"In a rare unilateral action, Delaware regulators have commissioned a wide-ranging environmental evaluation at the idled Evraz Claymont Steel plant, a longtime source of problems ranging from metallic soot and mercury to toxic contaminants in soil and groundwater."

"The largest source of chromium contamination near the Columbia River at Hanford has been removed after workers dug up contaminated soil down to groundwater 85 feet deep."

"Photographer and pilot Alex MacLean wanted to learn more about the Keystone XL pipeline, which if approved will carry oil from Canada to the Gulf of Mexico, so he decided to take pictures from above of the tar sands that will supply oil to the project. What he found shocked him."

"Newly released data from federal researchers suggests that coal ash in the Dan River has migrated fairly dramatically in recent weeks but stayed well upstream from Kerr Reservoir."

"State lawmakers who have been cutting environmental regulations in their quest for to streamline government have a new target: cutting the number of air quality monitors around the state."

"Two months ago, Range Resources trucked two small containers of waste from its natural gas drilling operations in Washington County, Pennsylvania, to a local landfill."

"Children who live in neighborhoods bordering Logan International Airport are as much as four times more likely to wheeze, experience shortness of breath, and exhibit other signs of undiagnosed asthma compared with children who live farther away, according to a long-awaited state report released Wednesday night."

"The country’s top 100 electricity producers have reduced emissions of major pollutants in recent years, showing that they could likely handle the new limits on carbon dioxide coming soon from the Environmental Protection Agency (EPA), according to a new report."