We use a chemical transport model (GEOS-CHEM) to quantify the contribution of long-range transported pollution to the European ozone (O 3 ) budget for the year 1997. The model reproduces the main features observed over Europe for O 3 , carbon monoxide and nitrogen dioxides, as well as two events of enhanced O 3 of North American origin over the eastern North Atlantic and over Europe. North American O 3 fluxes into Europe experience a maximum in spring and summer, reflecting the seasonal variation in photo…
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