Lee concluded that the spectrum was consistent with the presence of sulfur compounds.

When it reacts with some sulfur compounds, the product of the reaction is colored red.

These sulfur compounds can be removed with the following chemical reactions:

Other organisms eat sulfur compounds; the same chemicals that have been found in many regions of Mars.

This physically removes many of the sulfur compounds, which are then vented.

"The white is the result of light-scattering by sulfur compounds."

These bacteria are fed with sulfur compounds and oxygen.

Another possible cause is occupational exposure to sulfur compounds.

Method of preparation sinks for cleaning gases from sulfur compounds.