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21st International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes

27-30 September 2022 | Aveiro, Portugal


The 21st International conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes (HARMO21) is aimed towards model developers, model users, environmental protection agencies and legislation experts.

What distinguishes this conference from many others is its focus on common tools and methodologies.


Focus of the Conference

The series of international conferences on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes is concerned with the improvement of “modelling culture” both in Europe and at an international level.

Dispersion modelling is widely used for regulatory purposes, both for permits and for assessments, but there is a lack of sufficient mechanisms to make modelling processes transparent and ensure trust in its results.

There are many open questions and aspects of this, such as: Are the models scientifically sound for the purpose they are used? Are the models validated against observations or physical experiments? Are the models properly used by the experts? Are the users familiar with good practices and do they avoid bad practices? Are model developments sufficiently quality assured? Are reference problems established? Is proper exchange of experiences ensured? Work on these questions is needed in order to assess the air quality impacts on society and nature, on human health, biodiversity and climate.

Such issues that are not specific for one particular model, but common to several, are in focus at the 21st Int. conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes.

The series of Harmonisation conferences started in 1991 (see and is a natural forum for discussing modelling issues related to the European Union air quality directives. European networks such as the FAIRMODE network and COST Actions can use the conference in order to expose their work to a wider audience.

The Harmonisation conferences provide the ground where model users and decision-makers can bring their requirements to the attention of scientists and search together for better regulatory tools and indicators for the diverse impacts of air quality.

Important dates

15 March 2022

New short abstract submission deadline

16 May 2022

New date for confirmation of acceptance

17 June 2022

Last day of early bird registration

31 July 2022

Five-page extended abstracts submission deadline

31 July 2022

Last day of regular registration

27-30 September 2022

21st HARMO conference @ Aveiro, Portugal

Sessions organised within the following topics


Model evaluation and quality assurance – model validation, model intercomparisons, model uncertainties and model sensitivities


Environmental impact assessment: Air pollution management and decision support systems


Use of modelling in support of EU air quality directives, including FAIRMODE activities


Parametrization of physical processes and mathematical problems in meteorology and air quality modelling


Urban scale and street canyon modelling: meteorology, air quality and passive control systems


Use of modelling in health and exposure assessments


Inverse dispersion modelling and source identification


Modelling air dispersion and exposure to accidental releases


Highlights of past work (session devoted to reviews and to prominent scientists and ‘golden papers’ of the past, which have still relevance and should not be forgotten)

Special sessions


Modelling odour dispersion and exposure

Conference location: Aveiro, Portugal

The Conference will take place at the University of Aveiro, in Aveiro, Portugal, from 27 to 30 September 2022.

Aveiro is a dynamic medium size city that offers its inhabitants much of what big city life has, but without the urban chaos and without diminishing the quality of life. The focal point of an industrially developed region, Aveiro today is also a city of commerce and services and a growing centre of leisure and culture. It is impossible to speak of Aveiro without making a special note of the water that so characterises it.

The “ria” (inland waterways replenished from both the sea and the river) surrounds and penetrates the city and the extensive stretches of beach just a few kilometres away make the city very attractive for nature lovers and water sport enthusiasts. The delta plane of the city lies in contrast to the beautiful mountainous region to the inland areas of the district.

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