The Texas Climatological Model Version 2 (TCM-2) (Part of the UNAMAP version 4 collection) is a Fortran computer program designed to predict ground-level, long-term concentrations of atmospheric pollutants. The Model uses techniques that require much less computer time than most climatological models. Predictions are based upon the steady-state Gaussian plume hypothesis, Briggs plume rise formulations, Pasquill-Gifford dispersion coefficient approximations, and exponential pollutant decay. Long-term ground-level concentrations may be determined for one or two pollutants. Any number of point sources and area sources may be input to the model. Long-term meteorological conditions are input by a meteorological joint frequency function which gives the probability of occurrence for each of 576 different cases. Five scenarios of meteorological data and source emission inventories may be input to the model for one run. Plume rise is calculated by the most representative of six different methods and optionally can use only final rise. An option allows the simulation of dispersion found in urban areas. TCM-2 is well suited for, but not limited to, the following applications: Stack parameter design studies; Fuel conversion studies; Monitoring network design; Control strategy evaluation for SIP; Evaluation of the impact of new sources or source modifications for permit application review; Control technology evaluation; and Prevention of significant deterioration.