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Influence of the interactions of local dynamical processes with large-scale flow on air quality in the grenoble area

The vertical distribution of ozone over the Grenoble area is investigated for two summer smog episodes 
in 1999 and 2003. The effects of the interactions of local dynamical processes with large-scale circulations were 
estimated using numerical modelling. The results suggest that a terrain-induced shear layer above the boundary layer 
confines pollutants within the valley. Vertical exchanges through this shear layer have a considerable influence on the 
near-surface ozone concentration from day to day.