"A bipartisan group of senators has introduced a bill that would sidestep the stalled climate debate on carbon emissions and reduce other harmful gases by large margins in the next few years."

"Quebec’s tough new light vehicle emissions regulation has become a political hot potato in Canada after the federal environment minister, Jim Prentice, denounced the rule as 'counter-productive' last week in Calgary while laying out Canada’s down-graded emission targets."

"Downtown Chicago has the highest peak levels of nitrogen dioxide in the country, and is the only site in violation of new stricter guidelines against the irritant, which inflames asthma and other lung conditions."

"A federal judge on Thursday found Murphy Oil Co. liable for violating the federal Clean Air Act 21 times by releasing pollutants into the air in amounts greater than allowed under state permits for the company's Meraux oil refinery."

"A bipartisan group of U.S. senators on Thursday introduced legislation aimed at slashing emissions of sulfur dioxide, mercury and nitrogen oxide from smokestacks including coal-fired power plants."

"ARLINGTON, Va. -- Industry and environmental groups sparred at a public hearing here today over U.S. EPA's planned reconsideration of the George W. Bush administration's 2008 smog standard."

"U.S. EPA's final air quality standard for nitrogen dioxide (NO2) entails new requirements for measuring peak exposures near roads, but it would monitor fewer roadside locations than the agency's original proposal."

"The Environmental Protection Agency announced Monday that it would control -- for the first time -- short-lived spikes of an air pollutant common along major roads and linked to respiratory problems."

"An effort by railroad companies to control dust blowing from coal trains has drawn the wrath of electric-power generators and the attention of federal regulators."

After checking the math, Oregon regulators were surprised to discover the state's only cement plant emitted more mercury into the air than a major coal-burning power plant.

"Children in Texas are more likely to miss school when certain types of air pollution increase -- even when the levels are below the limit set by the federal government, a new study says."

"Exhaust from cars and trucks exacerbates asthma in children and may cause new cases as well as other respiratory illnesses and heart problems resulting in deaths, an independent institute that focuses on vehicle-related air pollution has concluded."

"The Environmental Protection Agency on Thursday proposed a stricter standard for smog-causing pollutants that would bring substantial health benefits to millions of Americans while imposing large costs on industry and local governments."

"To ensure that the most vulnerable Americans are better protected from exposure to lead, the U.S. EPA is proposing to revise the monitoring requirements for measuring airborne lead."

"The U.S. Environmental Protection Agency [Tuesday] finalized a rule setting stricter exhaust emission standards and cleaner fuel standards for large marine diesel engines on large U.S.-flagged ships, a part of the agency’s long-term strategy to reduce harmful marine diesel emissions."