We have developed ADMER Ver. 2.5, a model to estimate extensive atmospheric concentrations of chemical substances, and distribution of exposed population. ADMER Ver. 2.5 may be freely downloaded at http://www.aist-riss.jp/software/admer/ from August 5, 2008. AIST's Atmospheric Dispersion Model for Exposure and Risk Assessment (ADMER) is free software that can be used to calculate atmospheric concentrations of chemical substances in each area of Japan from data on emissions and meteorological conditions. The newly released, upgraded version makes it possible to display concentrations maps on satellite photos in Google Earth^TM. In addition, it has such features as enhanced calculation speeds through parallel processing, improved user-friendliness, and an in-built function to download Automated Meteorological Data Acquisition System (AMeDAS) data of the Japan Meteorological Agency. U.S. EPA (Environmental Protection Agency) began releasing atmospheric concentrations data using Google Earth^TM in 2007, but this is a first for Japan.