Yes. According to the American Lung Association, the levels of smog and pollution in some U.S. cities directly raises the risk that residents of those places will get asthma or have a heart attack. About half the U.S. population is at risk from ozone and particle pollutants, according to the ALA — especially children and the elderly. In acknowledgement of these claims, the Environmental Protection Agency is considering tightening the pre-existing limits on urban outdoor smog pollution.
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