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CALPUFF is an advanced non-steady-state meteorological and air quality modeling system developed by scientists at Exponent, Inc. It is maintained by the model developers and distributed by Exponent. The model has been listed by the U.S. Environmental Protection Agency (EPA) as an alternative model for as*essing long range transport of pollutants and their impacts on Federal Clas* I areas and for certain near-field applications involving complex meteorological conditions when the selection and use occur in agreement with the appropriate The modeling system consists of three main components and a set of preprocessing and post-processing programs. The main components of the modeling system are CALMET (a diagnostic three-dimensional meteorological model), CALPUFF (an air quality dispersion model), and CALPOST (a post-processing package). In addition to these components, there are numerous other processors that may be used to prepare geophysical (land use and terrain) data in many standard formats; meteorological data (surface, upper air, precipitation, and buoy Some examples of applications for which CALPUFF may be suitable include: The CALPUFF Modeling System is available from Exponent without charge. The main models (CALMET, CALPUFF, and CALPOST), and related processors are available for do*nload. You may also register to receive notices of model updates. The USEPA has approved an update of CALMET and CALPUFF from V5.8.4 (dated July 31, 2013) to V5.8.5 (dated December 14, 2015). This update includes code changes described in Model Change Bulletin H (MCB-H).  These changes include fixes to bugs in the implementation of PRIME downwash, along with updates to eliminate specific compilation and list file errors. CALMET has been updated from v6.334 to v6.4.0 (level 121203). This update includes the enhancements of polar stereographic mapping, increased maximum number of 3D.DAT files, and a compressible liquid water content output file. In addition, several bugs were identified