SAN DIEGO (FOX 5/KUSI) — An air quality advisory has been issued for neighborhoods in Southern San Diego after county environmental officials detected elevated levels of hydrogen sulfide in the air from transboundary wastewater and sewage flows near the Tijuana River Valley.
Hydrogen Sulfide (H₂S) is a gas that causes a strong rotten egg smell and can cause headaches and nausea.
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The San Diego County Air Pollution Control District (SDAPCD) issued the air quality advisory after hydrogen sulfide levels began going up March 28-29 in Imperial Beach, Nestor and San Ysidro, with the highest levels in Nestor.
SDAPCD did note that while an air quality advisory is in place currently, the levels could change throughout the day based on any changes in weather or wind patterns.
While the county is monitoring the levels of hydrogen sulfide locally, Airnow.gov monitors real-time air quality across the U.S., measuring ozone and fine particle pollutants, carbon monoxide, sulfur dioxide and nitrogen dioxide levels…