Biomass Magazine, Jan. 3, 2014, by Anna Simet.
http://www.biomassmagazine.com/articles/9872/epa-releases-proposed-update-to-residential-wood-heater-standards

"The U.S. EPA has released its New Source Performance Standards proposal for new woodstoves and heaters, which go into effect in 2015." Article includes a link to the full EPA report.