LAYOUT FOR AN ABSTRACT TO BE SUBMITTED TO THE 12TH INTERNATIONAL CONFERENCE ON HARMONISATION WITHIN ATMOSPHERIC DISPERSION MODELLING FOR REGULATORY PURPOSES Helge R. Olesen1 and Sonja Vidič 2 National Environmental Research Institute (NERI), Roskilde, Denmark 2 Meteorological and Hydrological Service of Croatia (MHSC), Zagreb, Croatia 1 ABSTRACT This is an example of short abstract (max 350 words) submitted to the 12th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Cavtat, Croatia, 6-9 October 2008. The conference language will be English. The text for the extended abstracts should be written in font 12 pt Times New Roman, justified and with single spacing between lines. However, when typing complicated mathematical text it is important to increase the space between text lines in order to prevent sub- and superscripts fonts overlapping. Paragraphs are separated with a blank line. The paper size is A4 with margins at 2.5 cm from the top and bottom and 2.5 cm margins from the left and right. Authors are kindly asked to submit their abstracts by 10 March 2008, preferably electronically as simple text via harmo12meteo.hr/harmo12/abstracts. If your abstract includes special symbols, equations or graphics, then please use this example to create an MS Word document, and send it by email to harmo12@harmo.org. The abstract text must not be longer than 350 words. SESSION PREFERENCES Please indicate whether you would prefer to give an oral presentation or poster presentation. Please indicate your preference for the session where your presentation may fit best: 1st/2nd/3rd choice Session No preference Model evaluation and quality assurance – model validation, model intercomparisons, model uncertainties and model sensitivities Environmental impact assesment: Air pollution management, decision support systems, emergency planning Regulatory models: country review Use of modelling in support of EU air quality directives Short distance dispersion modelling Meso-scale meteorology and air quality modelling Urban scale and street canyon modelling: meteorology and air quality Concentration fluctuations and odour