Hazardous air pollutant emissions from lumber drying

Methanol and formaldehyde are hazardous air pollutants (HAPs) and need to be estimated to ensure compliance with the Clean Air Act. Methanol, formaldehyde, and total hydrocarbon emissions were measured during the drying of ponderosa pine, lodgepole pine, southern pine, Douglas-fir, and white fir lumber. Methanol emissions ranged from 0.06 to 0.12 pounds per 1,000 board feet. Total hydrocarbon emissions ranged from 0.24 to 1.42 pounds per 1,000 board feet and were not a good indicator of the relative amount of methanol emissions from a species. Formaldehyde emissions were less than the methanol emissions by at least a factor of 10.

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