South Bay schools ban outdoor activities as air board issues rare public advisory
Sewage water filled with trash flow down the Tijuana River on Tuesday, April 9, 2024 in Imperial Beach, California. Discovery of a second, potentially lethal gas in the Tijuana River Valley where sewage from Mexico routinely spills over the border into south San Diego communities prompted South County school districts to cancel outdoor activities Monday and officials to reiterate calls for emergency assistance.
Upon learning of the new readings, county officials announced they were deploying the Hazardous Incident Response Team to the same Tijuana River Valley area to conduct its own readings. These teams are typically sent to ensure an area or structure is safe for firefighters and other first responders to enter.
According to the U.S. Centers for Disease Control and Prevention, hydrogen cyanide is a colorless, poisonous gas or liquid with a faint, bitter almond odor that can be a detected at 2-10 parts per million . It is used commercially for electroplating, fumigation, mining and making plastics and dyes. Exposure can lead to symptoms such as headache, nausea, vomiting and even death. Exposure thresholds only exist for workplace environments.
Also on Monday, the South Bay task force called on the county to distribute appropriate air filters to all affected households, place signs throughout the Tijuana River Valley cautioning recreationists of toxic gas exposure and for the air district to install fully-calibrated infrastructure to monitor the air for pollution.
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