New York, NY (AHN)- There's mixed news from a new report on air quality. While efforts to control air pollution from power plants are paying off, too many cities still have excessive air pollution.

The American Lung Association is now urging the federal government to control pollution from marine and locomotive sources.

The State of the Air, 2006 report finds that more than 150 million Americans still live in counties where they are exposed to unhealthful levels of air pollution.