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But now, more than three years later, the noxious odors and elevated hydrogen sulfide emissions persist, despite repeated complaints and appeals to the city of Los Angeles, air quality regulators and local officials.

If the wells weren't properly plugged, they can potentially leak oil and chemicals into nearby water sources or send toxic substances like benzene and hydrogen sulfide into the air.

However, the researchers found that treating the Golgi apparatus with hydrogen sulfide created T-cells that could take more stress.

But now this bioluminescent algae is dying and releasing hydrogen sulfide gas, which causes a rotten egg smell, explained Laura Rink, associate director at Heal the Bay Aquarium in Santa Monica.

Residents living near the river say they have been suffering unexplained illnesses, including gastrointestinal issues and chronic breathing problems, because of the stench of hydrogen sulfide.