Bay Area air quality improves

(KTSF by Sean Au)

A report by the American Lung Association on the air quality in U.S. metropolitan areas and counties shows that the air quality in the Bay Area has been improving in recent years.

The San Francisco metropolitan area is no longer among the 25 most polluted metropolitan areas in the country. The report is compiled from the measurement of ozone and polluting particles in the air conducted by the U.S. Environment Protection Agency. Ozone is mostly emitted from exhaust pipes of vehicles while polluting particles are mostly from the burning of wood. State legislation played  a big role in reducing the pollutants in the air in the Bay Area. California is also targeting 1 million zero emission vehicles on the roads by 2025.
In all of last year, ozone measurement in San Francisco has not once hit the unhealthy level set by federal agencies. Bay Area counties also on this list are Marin, Sonoma and Santa Cruz. However, Santa Clara County’s high car usage has made the county’s air quality the worst in the area. Yet, the report finds that air quality has improved by between 15 and 30% since 2004 for all counties.
As for the country, 9 out of the 25 top polluted counties, are in California. Other than San Luis Obispo in central California, the other eight are in southern California, with Los Angeles on top of the list.

(Copyright 2012 KTSF. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed.)

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