News release: “Key manufacturers of outdoor wood-fired heaters pledged to make units that will emit 90 percent less air pollution, under the second phase of a voluntary partnership with EPA. EPA launched the voluntary program in January 2007, beginning with units 70 percent cleaner than unqualified models. Sales of EPA-qualified units to date will prevent nearly 1,200 tons of fine particle emissions annually, providing more than $600 million in estimated annual health benefits.”