Elevated Hydrogen Sulfide Smells in South Bay Due to Heat and Tijuana Pump Failure

High temperatures and untreated wastewater flows from Mexico have led to increased hydrogen sulfide emissions in South Bay. A broken pump at a Tijuana sewage facility has exacerbated the situation. The San Diego Air Pollution Control District is monitoring the gas, known for its rotten egg smell, and has advised residents on how to mitigate exposure. Studies indicate that the area has experienced toxic gas levels significantly above urban norms, highlighting public health risks associated with chronic exposure.

Published Mar 21, 2026

High temperatures combined with untreated wastewater flows from Mexico have raised hydrogen sulfide emissions in South Bay. A broken pump at Tijuana's Pump Station PB1 contributed to the issue. The San Diego Air Pollution Control District is monitoring emissions, with levels reaching 4,500 parts per billion, significantly above the California limit of 30 ppb.

AI-curated by Theia

Residents are advised to limit outdoor activities and improve indoor air circulation. Studies have shown that poor water quality is linked to degraded air quality, exposing communities to toxic gases. Alerts are sent when hydrogen sulfide levels exceed 30 ppb, indicating serious public health concerns.