Nightly News   |  April 24, 2013

Air quality continues to improve

According to the American Lung Association’s ‘State of the Air’ report, 42 percent of Americans live in counties with unhealthy levels of air pollution, but there has been progress in reducing overall particle pollution. NBC’s Brian Williams reports.

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This content comes from Closed Captioning that was broadcast along with this program.

>>> new stats out tonight about our air and our cars. first off the american lung association and teheir state of the air report says 42% of us live in counties with unhealthy levels of air pollution . the good news, our air is generally cleaner and 16 u.s. cities are at their cleanest ever. most congested u.s. city, by the way, no surprise. los angeles . takes the crown.