The gases always include a carbon source, typically methane, and hydrogen with a typical ratio of 1:99.

Trace ices include 0.1% methane and 0.05% carbon monoxide.

These include oxygen, nitrogen, carbon dioxide, hydrogen and methane.

Strongly reduced gases include methane, ammonia, and hydrogen sulfide.

Other possible lighter-than-air gases include: methane, and ammonia.

Other gases given off include carbon dioxide and methane.

Some common reagent gases include: methane, ammonia, and isobutane.

Other qualifying technologies include methane, hydro, and biomass.

Acceptable contaminants include N, ethane (common precursor to ethylene), and methane.

The chemicals include carbon dioxide, methane and chlorofluorocarbons.