@
Trakhak, that's right, though living in such high density, the air is pretty bad to breathe. It's a lot better than when I was a kid, as environmental laws have improved things a lot. But we go out to the country often, and the difference is very noticeable.
Burning wood in cities is illegal, for good reason, but it makes sense in rural areas. It's one of the most popular home heating fuels in our rural area. Our house has a pellet burning stove which is a little more efficient than wood.