Typical ambient wood smoke bad: 98.5% suggestive - comparative epidemiology and cost benefit studies, where too many variables are ignored, predetermined conclusions are skewed towards and the sponsors desired conclusions are always expressed by their authors. 1.5% toxicology studies where the scientists give us accurate information and inconclusive results. This is state power and gas company, energy futures market, top down funded JUNK. Focus on the real industrial polluters and give up on carbon offsetting pish like all this is. You won't take away peoples self sufficient, carbon neutral, sustainable, cost effective energy choices!