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Dairy cows biggest air pollution source in San Joaquin Valley, CA

Air pollution from California dairies is significant
In California's San Joaquin Valley, the biggest cause of pollution isn't cars -
it's dairy cows. A review of scientific studies found that each year each cow in
the valley produces almost 20 pounds of volatile organic compounds (a form of
pollution that contributes to ground-level ozone and causes health problems like
asthma). The Los Angeles Times reported that based on this finding nearly 400
dairies in the valley will be required to get Air District permits and to invest
in pollution control measures to meet air quality regulations. The San Joaquin
Valley has the nation's worst air pollution and the highest number of dairy
cows. Read the article, or read a news release from the valley's Air Pollution
Control District (pdf).