The picture that we have in our minds of a dirty, sooty, pre-1990s woodstove is obsolete. Modern wood stoves are cleaner by a factor of three, and a modern pellet stove is cleaner by a factor of nine. That’s still nothing compared to a modern pellet boiler which is fully 140 times cleaner than that old woodstove. A pellet boiler is the real comparison to oil and gas.
So, let’s make sure we’re keeping it real when we talk about particulate emissions. The entire deviation between propane, oil, and a pellet boiler is less than a pound and a half annually. There’s really not much difference in particulate emissions between the three combustion central heating fuels.