"In August 2011, as President Obama prepared to unveil a major new environmental regulation on smog, his political advisers issued a warning: The rule would affect power plants and factories throughout the Midwest, slowing the economy in states like Ohio that would be crucial to the president’s re-election."

"The Environmental Protection Agency announced new rules Tuesday to reduce toxic air pollution from oil refineries by forcing operators to adopt new technology that better monitors and controls emissions."

"The Environmental Protection Agency is set to release a contentious new rule limiting surface-level ozone pollution."

"The U.S. Environmental Protection Agency plans sweeping changes to the way it tests for diesel emissions after getting duped by clandestine software in Volkswagen cars for seven years."

"Martin Winterkorn resigned as chief executive of Volkswagen on Wednesday, taking responsibility for an emissions cheating scandal that has gravely damaged the carmaker’s reputation."

"The Environmental Protection Agency and the California Air Resources Board claim VW deliberately programmed almost 500,000 diesel cars to emit fewer pollutants under test conditions than during actual use."

"Air pollution is killing 3.3 million people a year worldwide, according to a new study that includes this surprise: Farming plays a large role in smog and soot deaths in industrial nations."

""Major business groups are in the midst of a coordinated, multimillion-dollar effort aimed at sowing opposition to the Obama administration’s smog pollution regulations."

"The U.S. Environmental Protection Agency settled a lawsuit with North Carolina-based Duke Energy Corp., requiring the company to spend more than $5 million in penalties and other costs as it resolves alleged Clean Air Act violations."

"Regional air quality officials have tightened rules on odors and fumes coming from thousands of wells at hundreds of urban oil fields in Southern California. The move comes after coordinated campaigns by people living near oil operations in Huntington Beach, Whittier, and South Los Angeles."