Air quality concerns have risen in San Diego, as the County Air Pollution Control District (SDAPCD) issued an advisory due to elevated levels of hydrogen sulfide (H₂S) detected in the Tijuana River Valley. Residents near Berry Elementary School were alerted to increased measurements of the gas known for its "rotten egg" odor. According to the advisory, H₂S levels reached 93 parts per billion (ppB) between 7 AM and 8 AM, and 44 ppB in the following hour. The Office of Health Hazard Assessment's threshold for protecting sensitive individuals is 30 ppB, making this a significant exceedance that could affect children, the elderly, and individuals with certain health conditions.
The district has taken measures to continuously monitor the situation, as changing weather patterns could quickly alter the concentration of H₂S in the air. The advisory remains in effect until 5 PM, with updates to be provided if there are any new developments. To fully understand current air quality regarding H₂S, interested parties are encouraged to visit the San Diego County Air Pollution Control District. Those experiencing symptoms such as headaches and nausea, which can arise even at low exposure levels, should consider taking precautionary actions.
In response to the advisory, SDAPCD has recommended that residents limit their time outdoors and work to maintain a clean air environment within their homes by keeping their windows and doors closed. Usage of air conditioning systems or air purifiers has been suggested to mitigate indoor air pollution. Additionally, for households particularly affected by the odors, SDAPCD has extended an offer for a free home air purifier, details of which can be found on their website.
Notably, individuals with pre-existing respiratory conditions like asthma and COPD should be prepared and keep their rescue medications nearby. Those with worsened symptoms due to the strong odors should not hesitate to seek medical attention immediately. For businesses, it is advised to optimally run their HVAC systems for 1 to 2 hours before business hours to ensure a safer environment for employees and customers. A comprehensive list of these precautions and other guidelines can be located in the Community Hydrogen Sulfide Guidance document provided by SDAPCD and associated agencies. This document helps residents make sense of the H₂S levels and prescribes actions for varying level ranges.
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