American Lung Association
Kids with asthma, patients with lung cancer and adults with chronic obstructive pulmonary disease would all be at risk.
WHAT'S HAPPENING
Doctors, hospitals, nurses, the March of Dimes -- they're all opposed to the American Health Care Act.
Nearly 4 in 10 Americans live in areas with dangerous levels of pollution, according to the ALA's "State of the Air" report.
Environmental and public health groups say the new standard is a "betrayal" of clean air protections.