"As firefighters fought to control deadly wildfires north of San Francisco last month, a small unit of Alphabet Inc.’s Google had a more modest goal. It had employees driving cars around loaded with air-monitoring equipment to measure how badly the smoke was polluting the air."

"NEW DELHI — As thick smog crept over India’s capital this past week and smudged landmarks from view, Nikunj Pandey could feel his eyes and throat burning."

"The Environmental Protection Agency proposed a rule Thursday to repeal tighter emissions standards for heavy-duty trucks with older engines, an Obama-era regulation aimed at controlling soot and other pollutants along with greenhouse-gas emissions linked to climate change."

"The U.S. Senate voted on Thursday 49-47 to confirm a top air quality official at the Environmental Protection Agency, despite concerns raised by lawmakers over his industry ties."

"U.S. EPA Administrator Scott Pruitt is again signaling his determination to slow-walk key compliance decisions for the agency's 2015 ground-level ozone standard, raising the odds that only a prolonged court battle will settle the issue."

"California’s top water regulators adopted an agreement that commits the state to following through on plans of building wetlands and controlling dust around the shrinking Salton Sea over the next 10 years."

"The Environmental Protection Agency (EPA) won’t yet say which areas of the country do not meet the Obama administration’s 2015 regulation on ozone."

"Robert Phalen, an air pollution researcher just named to a key U.S. EPA advisory committee, is defending earlier comments that the air can be 'a little too clean' for children's health as grounded in the broader field of pulmonary medicine."