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Published July 1986 | public
Journal Article

A comparative study of equilibrium approaches to the chemical characterization of secondary aerosols


This paper presents an equilibrium model for prediction of the mass and chemical composition of atmospheric aerosols containing sulfate, nitrate, ammonium, and water. The Model for an Aerosol Reacting System (MARS) is particularly intended for incorporation into larger air quality, visibility, or aerosol dynamics models. Computational efficiency, in addition to satisfactory performance, is an important consideration in such applications. The predictions of MARS agree with those of two comprehensive models currently available. However, the computational efficiency of MARS is shown to be substantially greater than that of the other two models.

Additional Information

© 1986 Published by Elsevier. This study was sponsored by the EPA-ASRL Aerosol Research Branch. We would like to thank the Project officer, Dr H. M. Barnes, for suggesting this study and for his support. We would also like to thank MS Judy A. Rodich for her editorial effort. Although the research described in this article was funded wholly by the U.S. Environmental Protection Agency through Contract No. 68-02-4076, it does not necessarily reflect the views of the agency, and no official endorsement should be inferred. The computer code for MARS is available from the Project Officer at the U.S. Environmental Protection Agency, Atmospheric Sciences Research Laboratory, Research Triangle Park, North Carolina, or from the authors at Systems Applications, Inc.

Additional details

August 22, 2023
October 18, 2023