The makers of soy candles say that theirs produce less soot.

Fire-based cooking also produces ashes and soot, which make the home dirtier.

Additionally, the premixed lean mixture does not produce soot.

By burning cleaner, they would produce less soot.

The diesel combustion process produces soot or 'particulate' and this has received attention because of possible harmful health effects.

The combustion produces fewer greenhouse gases, less soot and lower smog-causing emissions.

Diesel engines can produce black soot (or more specifically diesel particulate matter) from their exhaust.

"As long as we have other technologies that are clean, I don't see the point in producing carcinogenic soot."

But for all the improvements in diesel, natural gas still produces less soot.

It burns with a green flame producing soot.