The USEPA approved in July 2016 an update of CALMET and CALPUFF from V5.8.4 to V5.8.5. This update includes code changes described in Model Change Bulletin H and include fixes to bugs in the implementation of PRIME downwash, along with updates to eliminate specific compilation and list file errors. Three years later after the last update approved by the US EPA, this second revision is still falling short for odour dispersion modelling.
The CALPUFF Modeling System is a non-steady-state puff dispersion model that simulates the effects of time- and space-varying meteorological conditions on pollution transport, transformation, and removal. According to the US EPA CALPUFF can be applied for long-range transport and for complex terrain.