SAN DIEGO (FOX 5/KUSI) -- The San Diego County Air Pollution Control District has issued an odor advisory due to elevated levels of hydrogen sulfide in the South Bay.

The advisory, which was announced Wednesday morning, impacts people living in communities in south San Diego County, including San Ysidro, Otay Mesa and cities near San Diego Bay and the Tijuana River Valley. • The Nexstar Media Wire video above explains the meanings of different air quality categories.

For more details regarding hydrogen sulfide monitoring, including community guidance, visit the air quality monitoring page here.

According to the district, hydrogen sulfide is a colorless gas with a "rotten egg" smell and can cause brief mild to moderate symptoms such as nausea, headaches, irritation in the eyes, nose an

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