The project is organized into four Scientific Themes designed to optimize the integration of methodologies, scales, and ultimately our understanding of air quality and climate interactions:

• Team 1 – Anthropogenic and biogenic emissions and their response to climate and socio-economy
• Team 2 – Atmospheric interactions among chemical and physical processes
• Team 3 – Regional and global links between atmospheric chemistry and climate change
• Team 4 – Air quality in a changing climate: Integration with policy

The scientific work, coordination of the project and results dissemination are achieved by 18 work-packages (WPs) that are clearly interconnected as shown in the pert diagram below:

WP Table

WP Number	PEGASOS WorkPackages	Type of Activity
WP1	Terrestrial trace gas emissions at the chemistry-climate interface	RTD
WP2	Anthropogenic emissions and their evolution	RTD
WP3	Future changes in anthropogenic emissions	RTD
WP4	Linking the anthropogenic, biogenic and observational footprint to large-scale model simulations	RTD
WP5	Quantifying and parameterising feedbacks in the atmosphere-biosphere system	RTD
WP6	Laboratory studies	RTD
WP7	Airborne field studies	RTD
WP8	Ground-based field studies	RTD
WP9	Integration and parameterization of experimental results	RTD
WP10	Model development and improvent	RTD
WP11	Assessment of model skill	RTD
WP12	Quantification of interactions in the AQ-climate system	RTD
WP13	Historical impacts of air quality-climate interactions	RTD
WP14	Model projections of air quality and climate change	RTD
WP15	Integrated analysis of multiple projections	RTD
WP16	Cost-optimal strategies for reducing pollutant concentrations	RTD
WP17	Knowledge integration and transfer	RTD
WP18	Coordination and Management	MGT