"A little-noticed change in U.S. EPA air policy has turned a national pollution-monitoring network that has been providing data to researchers for 22 years into a regulatory tool, leaving states scrambling to figure out the implications."

"Six months after Superstorm Sandy plowed through the Northeast, restoration efforts continue to move forward. New Jersey's Seaside Heights boardwalk is set to reopen Memorial Day, and some of the homes that were destroyed are starting to be rebuilt."

"Senator Barbara Boxer said on Tuesday she plans to investigate the explosion at a Texas fertilizer plant earlier this month that killed 15 people and injured scores more."

"Scientists say waste-treatment plants must follow subways and power stations in being protected against climate change."

"More than 5,000 products, including clothing, toys and bedding, contain toxic chemicals that could be dangerous for children’s health, yet stores still stock them and consumers know little about their content, an advocacy group reported this week."

"Environmental groups on Monday announced a new ad campaign that highlights ExxonMobil's massive oil spill in Arkansas last month. The ads will be concentrated in the Washington, D.C., Metro's Foggy Bottom station, which is used by many State Department employees commuting to work, as the agency considers whether to approve the construction of the Keystone XL pipeline."

"WASHINGTON -- President Barack Obama promised on Monday to ensure that scientific research is insulated from partisan politics, as government-funded projects come under attack from Republicans in Congress."

"WASHINGTON -- President Barack Obama said on Thursday he would pick Howard Shelanski, an antitrust expert, as his new regulatory czar, a powerful White House position charged with reviewing regulations proposed by government departments."

"PITTSBURGH -- The Environmental Protection Agency has dramatically lowered its estimate of how much of a potent heat-trapping gas leaks during natural gas production, in a shift with major implications for a debate that has divided environmentalists: Does the recent boom in fracking help or hurt the fight against climate change?"

"Federal officials are cautioning nuclear-powered plants that store spent fuel in dry casks to be on the lookout for water damage."