Wood heating appliances (wood stoves, boilers or furnaces) can create dense smoke for hours at a time. Whether smoke is visible or not, it contains:
Local ordinances may control the use of wood heating appliances.
Your chances of having health effects from smoke exposure depends on the concentration of air pollutants and how long you are exposed to them.
Toxic gases and fine particles in wood smoke are so small that they can penetrate into homes, even when windows and doors are closed.
If you are a homeowner with a wood heating appliance, like a wood stove or fireplace insert: