Ummmm........What? Wood for fuel is the most environmentally friendly fuel. It is naturally reoccurring and can be grown unlike oil, and natural gasses, etc. I wonder how much money utility and oil companies would lose if it was more socially acceptable to burn word for heat? I guess that's what lobbyist are for. How well stoves are made is a better concern. They can be made to recycle gasses that have not burned in the store until they are used making them more efficient, burn less wood, and produce more heat.
Now as far as air pollution goes, it's getting ridiculous. The US is not a big contender on air pollution on a global scale no matter what your news agency or politicians tell you. Of course most people don't put into consideration the effects of forest fires, field burns, volcanoes, and other natural ways for the planet to pollute itself. But hey, if one volcano puts out the equivalent of all the pollution in the US in one eruption it's still our fault. Other countries burn millions of metric tons of trash everyday, countries in the middle east burn crude oil as fuel for their power plants; and they don't use scrubbers in their stacks.
We complain because we can see smoke or smell a fire in someones home? But that's okay. We still have our big toys, vehicles, and commercial trucks that get 2-10 mpg. As long as we can't see our smell it, all is well. ??? Just my two cents.