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RAM: Gaussian Plume Multiple Source Air Quality Algorithm

The RAM program implements a gaussian plume multiple source air quality model that simulates the short term (1-24 hours) ground level concentrations of a pollutant at an urban scale on flat terrain. Its main features are the possibility of taking into account elevated area sources and of computing pollutant concentrations in no wind conditions. Chemical reactions are simply evaluated as a first order decay with a user defined time constant. The model uses the hypothesis of the narrow plume, so that only the sources within a 22.5° sector influence a given receptor site.


area: air quality
objectives: simulation
description: gaussian plume, elevated sources, point sources, area sources, urban sites, short term, flat terrain


You can download the software from
EPA - SCRAM Models

or directly: http://www.epa.gov/scram001/models/othreg/ram.zip

The model is part of UNAMAP and is available on diskette from:
Computer Products
National Technical Information Service
U. S. Department of Commerce
Springfield, Virginia 22161
Phone (703) 487-4650


Joseph A. Catalano
Aerocomp, Inc.
3303 Harbor Boulevard
Costa Mesa, CA 92626


D. Bruce Turner and Joan H. Novak
RTP, NC 27711


  • M.M. Benarie, 1980. "Urban air pollution modelling", Dr David Moore Editor.
  • G.A.Briggs, 1975. "Plume rise predictions", Lectures on Air Pollutions and Environmental Impact Analyses, American Meteorological Society, Boston, MA, pp.59-111.
  • G.A.Briggs,1984. "Plume rise and buoyancy effects", Atmospheric Science and Power Productions (edited by D.Randerson), Ch.8 DOE/TIC-27601, Technical Information Center, Department Of Energy, Oak Ridge, TN.
  • G.A.Briggs, 1974. DIFFUSION ESTIMATION FOR SMALL EMISSIONS, USA EC report ATDL-106. U.S. Atomic Energy Commision, Oak Ridge, TN.
  • EPA Publication No. EPA 600/4- 76-030b, 1980. U.S. Enviromental protection Agency, research trianglre Park, NC.
  • EPA-450/2-78-027R, 1986. GUIDELINE ON AIR QUALITY MODELS, U.S. Environmental Protection Agency.
  • F.A.Gifford, 1976. "Turbolent diffusion typing schemes - A review", Nuclear safety, 17:68-86.
  • Y.Ku, S.R.Rao and K.S.Rao, 1989. "A comparison study of three urban air pollution models", A.E. Vol.23.
  • GD.B.Turner and J.H.Novak, 1978. "User's guide for RAM", Vol I and Vol II, U.S. Enviromental Protection Agency Reports EPA-600/8- 78-016 a and b, Research Triangle Park, NC.


  • H.Ellis, P.Lou and G.Dalzell, 1980. "Comparison Study of Measured and Predicted Concentrations with the RAM Model at Two Power Plants Along Lake Erie", Second Joint Conference on Applications of Air Pollution Meteorology, New Orleans.
  • Y.Ku, S.R.Rao and K.S.Rao, 1989. "A comparison study of three urban air pollution models", A.E. Vol.23.



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