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Perhaps I'm very green but what could be more natural than a wood fire?
Just because you see a plume of smoke coming off it is not evidence of
pollution.

No, it's not evidence. That comes from people who know how to do it
analysing the flue gases. Burning wood produces all sorts of really
nasty chemicals.

Woodsmoke emissions contain things like carbon monoxide, various
irritant gases such as nitrogen dioxide, sulfur dioxide, hydrochloric
acid, and formaldehyde and chemicals known or suspected to be
carcinogens, such as polycyclic aromatic hydrocarbons (PAHs), and
dioxin.

Then there's all the tar and stuff. And the particulates - more from
stoves in some areas than from diesel engines.

--
Skipweasel
Pay no attention to that man behind the curtain.