Close to half of the children in the United States"more than 33 million kids"live in counties with dangerously high levels of toxic air pollution, according to the American Lung Association's annual air quality report out Wednesday. Harold Wimmer, president and CEO of the ALA, said at a time when the federal government should be strengthening air quality standards, President Donald Trump's Environmental Protection Agency (EPA) "is doing the opposite," despite Trump's campaign promise to deliver "the cleanest air." "In the last year, EPA has weakened enforcement and rolled back rules that would have protected kids from power plant and vehicle pollution," said Wimmer. "Children need clean air to grow and play, and communities need clean air to thrive. Leaders at every level must act to improve and protect America's air quality."