Emission factors for 19 polycyclic aromatic hydrocarbons were measured during wind tunnel simulations
of open burning for agricultural and forest biomass
fuels including cereal grasses, agricultural tree
prunings, and fir and pine wood (slash). Yields of
total PAH varied from 5 to 683 mg kg-1
depending
principally on burning conditions and to a lesser
extent on fuel type. Barley straw and wheat straw
loaded at 400−500 g m-2 emitted much higher
levels
of PAH, including benzo[a]pyrene, than other
cereal
and wood fuel types burning under more robust
conditions. As anticipated, total PAH emission rates
increased with increasing particulate matter emission
rates and with declining combustion efficiency.
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