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I'm not new to wood gas, there are byproducts from this, which require further processing, and just because they don't go out your tailpipe doesn't mean they don't exist:
"Pine and similar yeild more gas than hard woods, such as oak or beech. As a rough guide a cubic metre of dry pinewood will yield about 100kg of gas (which is mostly carbon monoxide and is toxic) plus about 120kg of charcoal (retort charcoal is spontaneously combustable so need careful handling), 25 kg of wood tar (useful stuff, but again needs care) and maybe as much as 160kg of "wood vinegar." Wood vinegar is for the most part a mixture of acetic acid (ethanoic acid) and methanol...which is poisonous."
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