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Rural Valley Smog Mystery Solved: Cattle Feed Emits Huge Levels Of Ozone

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The smog in California's San Joaquin Valley has puzzled scientists for years. Even though the region is largely rural and agricultural, its smog levels exceed those of densely populated cities like Los Angeles. A recent study published in the journal Environmental Science and Technology suggests that the primary culprit is actually cattle feed.

Read the whole story at The New York Times

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