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ISC: Industrial Source Complex dispersion model

ISC (Industrial Source Complex Model) has been specifically developed to simulate air pollution due to an industrial plant, taking accurately into account the effect of high stacks on the behaviour of the pollutant plume. It may be applied in urban or rural environment with a moderately complex terrain. Its numerous options allow to compute the dry deposition of the pollutant downwind the stacks, to model the plume hight accounting for the hydrodinamical effects, to simulate the impact of linear, area and volumetric sources. It works with non reactive pollutant, including particulate matter, but may include a first order decay.
The program has two versions. In the long term version (ISCLT), it computes average concentration values on an area of few hundred square kilometers for a period like a season or a year, on the basis of the correspondent meteorological data. The short term version (ISCST) computes mean concentration values for a period of one or few hours.


area: air quality
objectives: simulation
description: gaussian plume, stationary conditions, industrial sources, complex terrain, point sources, line sources, area sources, volume sources, long term, short term, short range, inactive pollutant


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


Curtis P. Wagner
TRC Environmental Consultants, Inc.
800 Connecticut Boulevard
East Hartford, Connecticut 06108


  • G.A.Briggs, "Diffusion estimation for small emissions" USAEC report ATDL-106. U.S. Atomic Energy Commision, Oak Ridge, TN, 1974
  • G.A.Briggs,"Plume rise predictions", Lectures on Air Pollutions and Environmental Impact Analyses, American Meteorological Aociety, Boston, MA, pp. 59-111, 1975
  • F.A.Gifford,"TURBOLENT DIFFUSION TYPING SCHEMES A REVIEW", Nuclear Safety, 17: 68-86, 1976. EPA-450/2-78-027R, GUIDELINE ON AIR QUALITY MODELS U.S. Environmental Protection Agency, 1986;
  • A.H.Huber, W.H.Snyder, "Wind investigation of the effect of a rectangular-shaped building on dispersion of effluents from short adjacent stacks", A.E. Vol.16, 1982;
  • F.Pasquill, "Atmospheric dispersion parameters in gaussian plume modeling part II: possible requirements for change in the turner workbook values", EPA publication no. epa 600/4-76-030b. U.S.Environmental Protection Agency, research triangle, park, nc., 1976;
  • D.B.Turner,"WORKBOOK OF ATMOSPHERIC DISPERSION ESTIMATES", PHS Publication No. 999-26. U.S. Environmental Protection Agency, Research Triangle, Park, NC, 1969;


  • J.F.Bowers, A.Anderson, "An Evaluation Study for the Industrial Source Complex (ISC) Dispersion Model", EPA Publication No. EPA-450/4-81-002, 1981;
  • J.F.Bowers, A.Anderson, W.R.Hargraves, "Tests of the Industrial Source Complex (ISC) Dispersion Model at the Armco Middle-town, Ohio Steel Mill", EPA Publication No. EPA-450/4-82-006, 1982;
  • J.S.Scire, L.L.Schulman, "Evaluetion of the BLP and ISC Models with SF& Tracer Data and SO2 Mesaurements at Aluminum Reduction Plants", Air Pollution Control Assosation Speciality Conference on Dispersion Modeling for Complex Sources, ST. Louis, 1981;



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