Officials are monitoring reports from the San Diego County Air Pollution Control District of an overnight uptick in hydrogen sulfide readings in the Tijuana River Valley, creating odor issues in South County. The increase in odors in the last 24 hours “appears to be associated with reports from the (International Boundary and Water Commission) that sewage infrastructure work in Mexico has resulted in the release of up to 5 million gallons per night of sewage into the Tijuana River Valley,” according to the county. This flow comes in addition to “rogue sewage flows” being investigated by the IBWC with its partners in Mexico. The IBWC operates the South Bay International Wastewater Treatment Plant and is tasked with collaborating with Mexico on border water issues.