UK has regulations on firewood sales now don’t they? Does Fairbanks too?Great point except EPA offers a cafeteria plan for the automotive industry. Chevy (as an example) can make 10,000 Suburban's that get 8 miles per gallon so long as they make and sell 200,00 Chevy Volts. (again only an example).
But reading the study, we need to remember that the fuel and the MC in the fuel was the greatest contributor to PM2.5. EPA and other are in Portola CA trying to now studying actual in-situ installations due to two of the greatest variabilities:
1) User interface
2) Speciation and MC
What's next, regulating the fuel we burn? (Just like the automotive industry)