Pellet quality impurities A previous NESCAUM study noted that the combustion of wood pellets “produces atmospheric emissions of particulate matter, carbon monoxide, nitrogen oxides, volatile organic compounds, mineral residues, and to a lesser extent sulfur oxides.”

The top three names are Enviro, Harman, and Quadrafire. They are only sold through dealers. My advice is to stay clear of the big box stores if possible since their offerings are lower quality products.