"California claims to know how much climate-warming gas is going into the air from within its borders. It’s the law: California limits climate pollution and each year the limits get stricter."

"Wildfires are increasing in frequency and intensity in many countries, spreading smoke that contains noxious gases, chemicals and particulate matter and carries serious health risks. More toxic than air pollution, wildfire smoke can linger in the air for weeks and travel hundreds of miles."

"The federal government gave schools billions for coronavirus mitigation over the past two years. Only recently, though, are most using those dollars for what has turned out to be a critical measure: keeping indoor air clean."

"The Department of Transportation on Thursday proposed a new requirement that states and metropolitan areas measure the amount of carbon dioxide being released through driving on interstate highways and other major roads."

"Following the Supreme Court’s landmark ruling last week limiting the government’s ability to restrict the pollution that is causing global warming, the Biden administration is planning to use other regulatory tools in hopes of achieving similar goals."

"A hole in the ozone layer seven times bigger than the one over the Antarctic continent has been discovered sitting over the tropics - and has been there for over 30 years."

"The natural gas delivered to homes contains low concentrations of several chemicals linked to cancer, a new study found. Researchers also found inconsistent levels of odorants — substances that give natural gas its characteristic “rotten egg” smell — which could increase the risk of small leaks going undetected."

"The air pollution flowing from vehicle exhaust pipes and the breakdown of rubber tires hangs over Toronto-area highways like a mostly invisible cloud."

"Breathing is more dangerous than smoking cigarettes or drinking alcohol."