calpuff update oct 19   CALPUFF Version 7.3.1 has been released. This version incorporates an agricultural spraying source type. In addition, several bugs were identified and fixed in Version 7.2.1 including issues with the use of multiple sub-hourly variable emissions files and processing missing layers in AERMET generated .PFL files. This model is out of the list of recommended models of the US EPA but it is the most appropriate under low wind/calm conditions that influence odour impact and with complex terrains. 

  The CALPUFF Modelling System is a non-steady-state puff dispersion model that simulates the effects of time- and space-varying meteorological conditions on pollution transport, transformation, and removal. In this CALPUFF has been updated to version 7.3.1. CALPUFF is composed of several post-processors. In this new version the post-processors CALPOST, CALSUM and POSTUTIL, have also been updated to allow processing of the new spray source type.

gram gral website picture   The Graz Lagrangian (GRAL) system is a closed-source Lagrangian particle model with a free Graphic User Interface (GUI) available in both Linux and Windows. This model has a special module focused on odour dispersion modelling and now, a new beta release has been distributed in the mail list of users, with an extensive list of changes.

   People interested in testing and trying this new beta, should subscribe to the official website of the project here. The current version 19.1 has been updated to the version 20.1. According to the release notes, this is the third beta of this version. There is no information on when the final version will be released.

oic separation distances   A very interesting and open access paper will be published this month in the Journal of Environmental Management. This paper is signed by the well-known experts Marlon Brancher, Martin Piringer, Andreas F.Grauer and Günther Schauberger and deals with the interesting topic of setting up separation distances to avoid odour impacts.

   This study shows that the use of different odour impact criteria (OIC) produces different separation distances between odour sources and residential areas for an equivalent level of protection.

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