The 4th Graz Lagrangian Model - GRAL User Workshop will be held in Innsbruck, Austria, on 12 – 13 March 2019. This recent lagrangian model is offered with a free GUI available in both Linux and Windows and has a special module focused on odour dispersion modelling. The workshop aims at giving an overview about all new developments, and it offers a distinct possibility for an informal exchange with other users and their specific experiences.This workshop is free.

 The Graz Lagrangian Model - GRAL - was initially developed in 1999, and has been used extensively in regulatory assessments and scientific studies. The initial driver for the development of GRAL was the need for a model that could deal with the frequent low-wind-speed conditions (< 1.5 m s^-1 for up to 90 per cent of the time) in the inner-Alpine basins of Austria. Some papers have recently being presented that compares the use of the GRAMM/GRAL in some odour emitting facilities. This software is freeware, but the code is unfortunately closed.

   The USEPA has approved an update of CALMET and CALPUFF from V5.8 (dated June 23, 2007) to V5.8.4 (dated July 31, 2013).

   CALPUFF is a multi-layer, multi-species non-steady-state puff dispersion model that simulates the effects of time- and space-varying meteorological conditions on pollution transport, transformation and removal.  CALPUFF can be applied on scales of tens to hundreds of kilometers.  It includes algorithms for subgrid scale effects (such as terrain impingement), as well as, longer range effects (such as pollutant removal due to wet scavenging and dry deposition, chemical transformation, and visibility effects of particulate matter concentrations).