WG41 of CEN is having today its second day of meetings to try to deliver a new standard on Instrumental Odour Monitoring Systems (IOMS). The meeting is taking place in Delft and a few representatives from Germany, Italy, the Netherlands, Belgium, Denmark, France and Spain are at this moment discussing the final details to deliver the draft of this standard, hopefully by 2020.
Technical groups 1/2, 3 and 5 are proposing new drafts that will be discussed during this meeting. This is the last meeting of 2019 that has been quite intensive in terms of work and number of meetings. 5 meetings took place in Antwerp, Milan, Bilbao, Barcelona and Delft only in this year.
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 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.