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by vanilla-almond 1589 days ago
Most candle wax is made from paraffin (derived from petroleum). More expensive candles made from beeswax won't be so polluting indoors, but a candle flame will always produce some soot.

An alternative is a fake LED candle with flickering 'flame'. All the ambience of a real candle without the noxious emissions! Of course, you still need a source of power, but LED candles can be powered by batteries and the battery power lasts longer than a wax candle melting.