This is a tool developed at NOAA ARL to handle I/O operations for atmospheric composition for python. It was originally part of the Model and ObservatioN Evaluation Tool (MONET; see Baker and Li (2017)).
Please refer to the readthedocs page at monetio.readthedocs.io for the documentation.
Baker, Barry; Pan, Li. 2017. “Overview of the Model and Observation Evaluation Toolkit (MONET) Version 1.0 for Evaluating Atmospheric Transport Models.” Atmosphere 8, no. 11: 210