California cities are worst air polluted in US

About 154 million Americans — or more than half the U.S. population — live in areas where the air is so polluted that it is often dangerous to breathe, a new report says.

Residents of Honolulu and Santa Fe-Espanola, N.M., on the other hand, are in luck: Those two cities had air that is among the country's cleanest — and they were the only two in the nation that had no days in which smog and soot levels reached unhealthy ranges.

In contrast, residents of California, which is famed for its healthful lifestyle, are breathing some of the worst air.