New Beta version 20.1 of GRAL model

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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.

Do odour impact criteria of different jurisdictions ensure analogous separation distances for an equivalent level of protection?

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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.

CALPUFF Model, History and Current Status – Part 1

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CALPUFF 2003 2019

   Dispersion modelling is a key element of most odour assessments around the world. There are 2 or 3 well known dispersion models developed for regulatory assessments of which the most well-known are, AERMOD and CALPUFF. Because both models have been US EPA guideline models until CALPUFF was recently removed in 2017, they are routinely used in most air quality and odour assessments.

   This article highlights the history and background behind CALPUFF and, the reason for its removal as a US EPA guideline model. Concerns with AERMOD for odour assessments will be presented in a separate document, Part 2.

Jennifer Barclay

Atmospheric Science Global (ASG). Auckland, New Zealand


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