Despite improvements in air quality in past decades, 156 million Americans still breathe in too much soot or ozone, says the ...

Air pollution levels keep getting worse for more people in the US, according to a new report, and experts say the Trump ...

Air in the U.S. has gotten cleaner for decades, adding years to people's lives and preventing millions of asthma attacks, but nearly half of Americans still live with unhealthy air pollution, a ...