My issue with the current methodology of stove testing is the fact that real world emissions are not the same as the lab tested emissions. If every wood stove truly emitted 2.0g/hr in every home they were installed in smoke from wood stoves would be much less of an issue. 2.0g/hr isn't much more than a modern diesel pickup is permitted to emit.
I know and understand that a repeatable test is needed to create some kind of baseline and maximum PM quantity to not exceed, which is fine if it weren't for the fact that "meets EPA 2020 2.0g/hr emissions" are plastered all over marketing materials for almost every manufacturer. It just gives so much ammunition to anti-wood heat activists, really it's not a whole lot different than the whole dieselgate saga, where emissions passed legal requirements on the test dyno, but were actually orders of magnitude higher in real world operating conditions.
What I know is this, once the EPA receives enough pressure from outside entities, or a mandate from the federal government, emissions limits will tighten, and with the stroke of a pen legislation will be enacted to drastically curb wood smoke emissions from stoves, regardless of manufacturer or stove user input. It will be a scenario very much the same as with diesel engines in the late 2000's, changes will be rammed through, some manufacturers will adapt and thrive, some will struggle, some will exit the industry completely, and another group will offer services to remove or alter pollution controls and the EPA will fine them into bankruptcy.