Where breathing local air is a concern in the U.S.
In its annual ‘State of the Air’ report for 2016, the American Lung Association reports that despite the continued improvement in air quality, there are still over 166 million Americans at risk of averse health effects on account of unhealthy air throughout the country.
There are still nearly 20 million people in the United States that live with unhealthful levels of all three measures of air pollution the report tracks: ozone, short-term and year-round particle pollution