UPDATE: Manufacturers of wood-fired boilers have not shown the state of Washington that their devices produce 4.5 grams/hour or less. For this reason, wood-fired boilers continue to be prohibited throughout the Washington.
Yes. Newly manufactured indoor wood stoves are required to meet strict Washington State particle emissions standards, 2.5 grams per hour for catalytic stoves and 4.5 grams per hour for noncatalytic stoves. In contrast, tests done by the Northeast States for Coordinated Air Use Management (NESCAUM) found that the average fine particle emissions (a particularly harmful pollutant) from one OWB are equivalent to the emissions from:
* 22 EPA certified wood stoves,
* 205 oil furnaces,
* or as many as 8,000 natural gas furnaces
One OWB can emit as much fine particle matter as four heavy duty diesel trucks on a grams per hour basis. The smallest OWB has the potential to emit almost one and one-half tons of particulate matter every year. Although older style indoor wood stoves emit more than new certified stoves, they are still several times less polluting than OWBs. Due to their poor combustion conditions, it is also probable that OWBs emit proportionately more benzene, polycyclic aromatic hydrocarbons, formaldehyde and other toxic partial combustion products which have been linked to asthma, heart attacks and cancer.
The above is an excerpt from the Washington State Department of Ecology website on air quality and outdoor wood boilers. Visit the site to learn more. Washington State prohibits outdoor wood boilers because clean air and residential property values are defended priorities in their communities.