NPR's Michel Martin talks Peter DeCarlo at Johns Hopkins University about the haze and air quality alerts throughout the U.S. that are generated by hundreds of wildfires in Canada.
The National Weather Service said air quality has "plummeted" across the Northeast. A disaster preparedness expert says people should take the warnings seriously.
Officials in Canada's Atlantic Coast province of Nova Scotia said a wildfire that forced thousands of residents from their homes is now largely contained because of rain.
Hoang Hong, founder of the environmental group CHANGE VN, was arrested Wednesday on tax charges, the U.N. says. Human rights experts say Vietnamese officials use the law to target civil society.
Cities are trying to help residents during extreme weather events. In New Orleans, churches and community centers have come together to create "community lighthouses" that will help after hurricanes.
U.S. Poet Laureate Ada Limón has written a poem that will fly on NASA's Europa Clipper, which will explore one of Jupiter's moons. And you can add your name to the poem.