A deep look at the Mexican city of Mexicali shows a pattern of unchecked pollution leading to illnesses and deaths on both sides of the border.

"The White House's regulatory shop has completed its assessment of a hot-button ozone rule, putting EPA on track to issue the final version by tomorrow's [Thursday's] court-ordered deadline."

"The level of air pollution in California exceeded world “safe” levels by about 60 times last week after a series of deadly wildfires."

"President Trump has nominated his top regulatory official to take over a vacant seat on the U.S. Court of Appeals for the D.C. Circuit, according to a White House pool report."

"The Environmental Protection Agency on Tuesday announced plans to place more stringent restrictions on pollution from heavy-duty trucks, in a move that won the Trump administration rare praise from environmental groups."

"The U.S. Environmental Protection Agency will announce plans to propose new rules to significantly decrease emissions of smog-forming nitrogen oxide from diesel-powered heavy-duty trucks, an agency official said."

"A blanket of smog greeted residents of New Delhi on Monday as air quality deteriorated sharply overnight in India's capital, triggering warnings that even healthy people were at risk of health problems."

"Earth’s protective ozone layer is finally healing from damage caused by aerosol sprays and coolants, a new United Nations report said."