Prepared for the U.S. Department of Energy under Contract DE-AC06-76RLO 1830 Pacific Northwest Laboratory Operated for the U.S. Department of Energy by Battelle Memorial Institute DISCLAIMER This report was prcparcd as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor any agency thereof, nor Battelle Memorial Institute, nor any of their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for theaccuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Refcrcncc hcrcin to any spccific commercial product, process, or scrvicc by trade name, trademark, manufacturer, or otherwisedoes not necessarilyconstitute or-imply its endorsement, recommendation, or favoring by the Uniled States Government or any agency Ihcreof, or Ualtelle Memorial Institute. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Governmcnt or any agency thereof. PACIFIC NOKTHWEST LABORATORY operated by BATTELLE MEMORIAL INSTITUTE for the UNITED STATES DEPARTMENT OF ENERGY under Contract DE-AC06-76RL 0 1830 Printed in the United States of America Availahle to DOE and DOE contractors frum the Office of Scientific and Technical Information, P.O. Box 62, Oak Ridse, TN 37t131; prices availahle from (61 5) 576-U4Ol. FTS 6Z6-U4UlI

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This report describes a sulfur oxides atmospheric pollution model that calculates trajectories using single-layer historical wind data as well as chemical transformation and deposition following discrete contaminant air masses. Vertical diffusion under constraints is calculated, but all horizontal dispersion is a function of trajectory variation. The ground-level air concentrations and deposition are calculated in a rectangular area comprising the northeastern United States and southeastern Canada. Calculations for a 29-day assessment period in April 1974 are presented along with a limited verification. Results for the studies were calculated using a source inventory comprising 61% of the anthropogenic S02 emissions. Using current model parameterization levels, predicted concentration values are most sensitive to variations in dry deposition of S02' wet deposition of sulfate, and transformation of S02 to sulfate. Replacing the variable mixed-layer depth and variable stability features of the model with constant definitions of each results in increased ground-level concentration predictions for S02 and particularly for sulfate.