"The Obama administration's scrapping of a proposed new rule that would toughen ozone standards has put lawyers involved in litigation over the existing regulations on alert."

"Health experts lamented a move by U.S. President Barack Obama to halt rules on limiting smog pollution, saying the decision could endanger many people already susceptible to respiratory problems.

Under pressure from businesses and Republican lawmakers, the Environmental Protection Agency had delayed issuing a rule on ozone limits several times. On Friday, Obama unexpectedly told the EPA to withdraw the clean-air initiative. Even at current levels, doctors and public health groups warn that ozone, a key smog ingredient, is harmful, especially for those already suffering from lung diseases."

"President Barack Obama put a stop on Friday to new rules that would limit smog pollution, unexpectedly reversing course on a key policy measure after businesses said it would kill jobs and cost them billions of dollars."

"Significant levels of the world's most-used herbicide have been detected in air and water samples from two U.S. farm states, government scientists said on Wednesday, in groundbreaking research on the active ingredient in Monsanto Co's Roundup."

"The White House is engaged in an intense debate over how much it should tighten national smog standards, an issue that has sparked a battle between business and public health groups.

"Every summer, hordes of beach-goers seeking California sunshine are attracted to the Central Coast. Clad in bikinis and swim shorts, they hit the beach only to be greeted with a sobering surprise: a dense layer of coastal fog rolling off the bay."

"Under Obama, the agency has delayed action repeatedly on a 2010 vow to set tougher smog standards, as critics in industry and the Republican Party argue that regulations kill jobs."

"NASA, the agency best known for exploring space, is trying to answer some urgent questions about air pollution right here on Earth."