(e) Pellet Fuel Requirements. Operators of wood heaters that are certified to burn pellet fuels may only burn pellets that have been produced under a licensing agreement with the Pellet Fuels Institute or an equivalent organization approved by the EPA. The pellet fuel must meet the following minimum requirements:
(1) Density: consistent hardness and energy content with a minimum density of 38 pounds/cubic foot;
(2) Dimensions: maximum length of 1.5 inches and diameter between 0.230 and 0.285 inches;
(3) Inorganic fines: less than or equal to 1 percent;
(4) Chlorides: less than or equal to 300 parts per million by weight;
(5) Ash content: no more than 2 percent; and
(6) A quality assurance process licensed by the Pellet Fuels Institute or equivalent organization approved by EPA.
Of course, that chunk included a town where the EPA tried to claim fracking had ruined the groundwater (Pavilion, WY), but had done such a lousy job of constructing their test wells the USGS wouldn't sign off on the results (turns out the EPA had drilled down into a hydrocarbon bearing formation, among other things.
The EPA has no Constitutional mandate, nor authority, and should be dissolved.
Environmental issues should only hit the Federal level if they involve States which cannot resolve those issues, otherwise, the states should have their own standards and enforcement. It should not be a Federal issue.
There is simply no way a wood stove in a house on the prairies of North Dakota will have the same impact as one in an urban area on air quality, and the one-size-fits-all regulations of Federal agencies don't fit.