NOAA's Air Resource Laboratory (ARL) provides interactive transport and dispersion modeling at this website. Users can find instructions, trial versions, and a download for the Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model, which can be used to compute simple air parcel trajectories as well as complex dispersion and deposition simulations. The site also offers transport and dispersion models to assist with many air quality and meteorological problems including volcanic ash and smoke forecasting. Researchers can find current and archived meteorological data for the world. Users can discover how the models assist the United States government's emergency response activities.
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