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CITYZEN : Megacity - zoom for the environment


We will determine the air pollution distribution and change in and around hotspots over the last decade from extensive satellite and in-situ observations and we will employ a series of different scale models in order to analyze the impacts of air pollution hot spots on regional and global air quality including potential future changes for various climate scenarios. Focus is on ozone and particulate matter with chemical and physical characterization, and their precursors. The Eastern Mediterranean (Istanbul, Athens, Cairo), the Po Valley, the BeNeLux region, the Pearl River Delta in China (with megacities Guangzhou and Hong Kong) and the hot and polluted European summer 2003 are chosen for intensive case studies. . *Estimate the future impact from emission changes with a focus on the effect of rapid growth in the population of megacities/hot spots and the increasing background of pollutants (concentrate on ozone, particulate matter PM, and their precursors) *Estimate how megacities/hot spots influence climate change *Estimate how megacities are responding to climate forcing which can influence transport patterns, chemical oxidation and biogenic emissions (especially biogenic volatile organic compounds BVOC) *Study mitigation options, e.g. by introducing biofuel, to keep the air pollution load in and around megacities/hot spots within sustainable limits in terms of human health effects and climate impact. *Develop tools to estimate interactions between different spatial scales (megacities to global) *Bring the scientific results and methods developed and applied during the course of the project to semi-operational use with those consortium partners that on a more permanent basis provide technical underpinning of policy work, that is, ensure an excellent return on the investment in the project both during and after the project has ended.

Project information


Meteorologisk institutt (metno)/Norway; Peking University (PKU)/China; Centre National de la Recherche Scientifique (CNRS)/France; Institut National de l'Environnement Industriel et des Risques (INERIS)/France; Universität Bremen (IUP-UB)/Germany; Rhenish Institute for Environmental Research at the University of Cologne (FRIUUK)/Germany; Forschungszentrum Jülich GmbH (FZJ)/Germany; University of Crete (ECPL)/Greece; Consiglio Nazionale Delle Ricerche (CNR)/Italy; Norsk Institutt for Luftforskning (NILU)/Norway; Universitetet i Oslo (UiO)/Norway; Institute of Marine Sciences-Middle East Technical University (METU)/Turkey; University of Leicester (ULeic)/United Kingdom; International Institute for Applied Systems Analysis (IIASA)/Austria; National Observatory of Athens (NOA)/Greece; Cairo University Center for Environmental Hazard Mitigation (CEHM)/Egypt

Source of funding
FP 7

Reference information



Co-benefits - Adaptation and Mitigation, air quality, ozone, particulates



Climate impacts

Extreme Temperatures


Observations and Scenarios, Vulnerability Assessment


Buildings, Urban

Geographic characterization


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