http://www.lungusa.org/assets/documents ... t-2010.pdf
This is a comprehensive report, and is packed with information, including the latest research on air pollution.
There is even a recommendation on wood burning:
What needs to be done to get healthy air: What you can do
Don’t burn wood or trash. Burning firewood and trash
are among the largest sources of particles in many parts of
the country. If you must use a fireplace or stove for heat,
convert your woodstoves to natural gas, which has far
fewer polluting emissions. Compost and recycle as much as
possible and dispose of other waste properly; don’t burn it.
Support efforts in your community to ban outdoor burning
of construction and yard wastes. Avoid the use of outdoor
hydronic heaters, also called outdoor wood boilers, which
are often much more polluting than woodstoves.