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AtChem2 is a modelling software designed to run box-models using the Master Chemical Mechanism (MCM, http://mcm.leeds.ac.uk/MCM/), although it can be used with any chemical mechanism in the FACSIMILE format.

AtChem2 is a development of AtChem-online (https://atchem.leeds.ac.uk/webapp/), redesigned to run larger simulations and with an improved user interface. The redeisgn includes a complete rewrite of code base to modern Fortran standards, test suite, version control. AtChem-online is a web tool developed at the University of Leeds within the EUROCHAMP (http://www.eurochamp.org/) project to facilitate the use of the MCM to simulate environmental chamber experiments. A tutorial for AtChem-online, with examples and exercises, is available at http://mcm.leeds.ac.uk/MCMv3.3.1/atchem/tutorial_intro.htt. A help page with detailed instructions and description of the model parameters and variables is available at https://atchem.leeds.ac.uk/webapp/run/help.html.

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To install and run AtChem2 follow the instructions on the Installation and Dependencies pages.

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AtChem2 is open source. The contributors to AtChem online and AtChem2 are listed in the Acknowledgements and Credits page.

Bug reports, suggestions and contributions are welcome. In order to contribute to the repository, please fork AtChem/AtChem2 to a local repository, make your edits on a branch, and then submit a pull request. A style guide is available.