Animal feed worse than traffic for San Joaquin Valley smog

A new study identifies cattle feed as a possible culprit in the long-standing mystery of why California's San Joaquin Valley - a moderately-populated agricultural region - has higher levels of ozone (one of the main ingredients in smog) than many densely-populated cities. The report, which explains how fermented cattle feed works with automotive exhausts in forming ozone, is in ACS' Environmental Science & Technology.

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