Particulates - perhaps the most dangerous component of wood smoke is the countless airborne particles (particulates). Airborne particles smaller than 2.5 microns are harmful because they are tiny enough to lodge inside lung tissue, while particles larger than 2.5 microns are coughed out. Researchers have discovered that the particles found in wood smoke are almost all smaller than 2.5 microns.
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Carcinogenic substances - some of the carcinogenic substances identified in wood smoke include aldehydes and polycyclic aromatic hydrocarbons and dioxins.
THE HEALTH PERILS OF WOOD SMOKE @ DISABILITY ONLINE (Victorian Government)
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