sulfide

Dimethyl sulfide is the largest natural source of atmospheric sulfur on Earth, which means that it gets into the atmosphere and cycles around.

Most forms of selenium are not considered carcinogenic; the EPA, however, has determined that one form, selenium sulfide, is a probable carcinogen.

Residents have also raised concerns about the potential health effects of high levels of hydrogen sulfide and other gases and vapors emanating from the river.

In July, El Sobrante staff told the local air district the landfill had experienced a rise in highly flammable hydrogen gas and lung-aggravating dimethyl sulfide emissions — both telltale signs of abnormal temperatures inside the landfill.

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.