Toxic air pollution levels in the US are at the worst levels in the last 25 years, raising health concerns for more than one-third of Americans.The American Lung Association (ALA) revealed in a new report that 39 percent of Americans are living in regions with unhealthy air pollution levels.To discern the heightened pollution levels, the ALA looked at the daily and annual averages of particle and ozone pollution, released from plants and refineries.
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