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New tool aims to pinpoint which cities have the worst air




A view of downtown Los Angeles,California is seen on a smoggy afternoon, 02 November 2006. Due to the city's geography making it susceptible to atmospheric inversion as well as the heavy reliance on automobiles as a major source of transportation, the city suffers from air pollution in the form of smog.
A view of downtown Los Angeles,California is seen on a smoggy afternoon, 02 November 2006. Due to the city's geography making it susceptible to atmospheric inversion as well as the heavy reliance on automobiles as a major source of transportation, the city suffers from air pollution in the form of smog.
GABRIEL BOUYS/AFP/Getty Images

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California's Environmental Protection Agency is rolling out a new tool on Tuesday, to help pinpoint communities that may be particularly vulnerable to pollution. It's the first environmental index of its kind in the nation, measuring a broad range of pollutants and health indicators in every zip code across the state.

RELATED: California pollution map: LA has 3 of the top polluted areas

But the tool is already proving controversial, as the California Report's Central Valley Bureau Chief Sasha Khokha explains.