Los Angeles used to be one of the most polluted cities on the planet. After decades of improvements, pollution levels are ticking up again.
Two women wear face masks on May 16th, 2019, in Mexico City, Mexico.
According to researchers, air pollution kills thousands in the city every year.
The suit claims that sources of air pollution located within Illinois, Michigan, Pennsylvania, Virginia, and West Virginia are contributing to smog in New York and Connecticut.
Serious crimes are more likely to occur in neighborhoods downwind of air pollution, according to a new study.