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Rotten egg smell traced to California's Salton Sea

Rotten egg smell: Scientists say strong winds from a storm churned the Salton Sea, stirring up foul-smelling gasses from the lake bottom. The Salton Sea is 150 miles southeast of Los Angeles.

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Dead fish along the Salton Sea shoreline in southern California. The South Coast Air Quality Management District acknowledged the possibility that dead fish at the Salton Sea are partially to blame for the rotten-egg smell reported all day Monday.

(AP Photo/Nick Ut)

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After a day of "odor surveillance" and other scent-based sleuthing, Southern California air quality investigators confirmed Tuesday what they had already expected — that a pungent, rotten-egg aroma that stretched across the region came from the Salton Sea.

Investigators from the South Coast Air Quality Management District collected air samples, modeled weather patterns and measured hydrogen sulfide levels to determine that Monday's stench came from the saltwater lake 150 miles southeast of Los Angeles, as strong winds from a storm churned the water and stirred up foul-smelling gasses from the lake bottom, where they normally are trapped.

A recent fish die-off was likely a contributing factor, said Andrew Schlange, general manager at the Salton Sea Authority.

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"We now have solid evidence that points to the Salton Sea as the source of a very large and unusual odor event," AQMD Executive Officer Barry Wallerstein said in a statement.

Wallerstein said the agency sent technicians trained to gauge the severity of smells across the agency's four-county jurisdiction, where they conducted "odor surveillance."

The air samples showed that levels of hydrogen sulfide, which has an unmistakable rotten-egg odor, were highest around the lake and grew weaker at bigger distances.

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