USC researchers looking at impacts of hydrogen sulfide on El Segundo residents

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USC researchers looking at impacts of hydrogen sulfide on El Segundo residents
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With lingering effects from the 2021 Hyperion sewage spill, a concerned resident hopes the study leads to updated air quality standards.

It’s safe to breathe low levels of hydrogen sulfide for about an hour, according to state air regulators.

“The problems aren’t daily, but when it stinks you’ll get a headache, runny eyes, super tired, your skin will itch,” said El Segundo resident Corrie Zupo. “It’s acute and not a high priority, but if you’re exposed to it all the time, if you have a headache every day it’s going to drive you crazy.” The California Department of Public Health, meanwhile, reviewed the standard in 1981 and concluded that it was still adequate, according to the board.

The U.S. Environmental Protection Agency, for its part, does not have a national ambient air quality standard for hydrogen sulfide. Hyperion recycles about 260 million gallons of wastewater every day for landscape irrigation, industrial processes and groundwater replenishment.Plant officials faced a tough choice: Either release 17-million gallons of untreated sewage into the ocean or risk the sludge backing up into people’s homes and onto surrounding streets — and potentially having the entire facility go offline.

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