| California metros have the country's worst air, followed by Phoenix and Pittsburgh. California metros "really have made great strides to try to clean up, but they have a lot of sources--a lot of people driving, a lot of ships coming into the port, especially ocean-going vessels," explains Janice Nolen, lead author of the report and an assistant vice president of national policy and advocacy at the ALA.
"Plus, California has the warm, sunny climate that encourages pollutants to form and the geography that helps trap them.".............................................Full Article: Source
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