The SmitOlfo software (SMIT – Multimodal system of spatial information), developed in collaboration with Comai Srl, allows for accurate modelling of pollutant dispersion.

SmitOlfo, accessible via a web platform, collects data acquired by OlfoSense units and key meteorological data, and constructs the diffusion plume of odours, pollutants, and fumes.

The resulting model allows for an efficient environmental impact assessment from point sources (chimneys), linear sources, or area sources (ground deposits).

The software is based on the ISC AERMOD hybrid Gaussian model (U.S. EPA) and its operational procedure is as follows:

• Acquisition of local meteorological data if available, or calculated from nearby stations if unavailable. In this phase, wind speed and direction classes and other weather conditions of the area useful for subsequent processing are defined.
• Based on the definitions of the classes and “sensitive receptors”, atmospheric dispersion from the source and the relative plumes are calculated as average values (periodic or annual basis) for each quadrant of interest.

The software is used for two purposes:

• to provide a real-time overview of the ongoing diffusive situation.
• To perform a predictive simulation based on high-resolution meteorological forecast data. In this case, the model is capable of providing a predictive overview for up to the next 72 hours.

Fundamental parameters for the correct operation of the model are:

• real-time meteorological data (for predictive simulation) and annual historical data.
• Orographic data of the area.
• Possible presence of obstacles (buildings, vegetation, etc.).
• Localisation of sensitive receptors.
• Technical data of the facility (activities performed, surfaces and emission flows, etc.).