The air district’s governing board also agreed to deploy air purifiers to impacted households in South County using federal grant dollars
A woman cover her face with a sweater during a press conference to discuss the Tijuana River sewage crisis on Thursday, Sept. 12, 2024 in San Diego, California. The San Diego County Air Pollution Control District will be expanding its role in addressing the foul odors affecting communities near where sewage spills over the U.S.-Mexico border, following conflicting reports earlier this week about whether the stinky air people breathe is dangerous.
The air district will also deploy air purifiers to impacted households in South County using at least $100,000 in grant funding from the U.S. Environmental Protection Agency. Plans also include searching for additional money for purifiers or other personal protective equipment. Last month, the county gave away about 400 purifiers.
California’s standard for hydrogen sulfide levels outdoors is 30 parts per billion averaged over one hour, which can cause headaches and nausea. Over at the Tijuana River, polluted flows have stopped, the U.S. International Boundary and Water Commission announced Wednesday. A key sewage pump in Mexico, known as PBCILA, that’s supposed to divert wastewater from the river and clean it at treatment plants is back online.
“We’ve been consistently seeing hydrogen sulfide concentrations in the 1,000s for anywhere from 1 to 4,000 parts per billion,” Ben Rico, a graduate student working with UC San Diego’s Prather, said Thursday morning at a news conference in the river valley. “And last night, now that the river flow has dropped considerably, we’ve seen the peak concentration was below 100 parts per billion.”
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