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This paper describes the global chemistry Transport Model, version 5 (TM5) which allows two-way nested zooming.The model is used for global studies which require high resolution regionally but can work on a coarser resolutionglobally.The zoom algorithm introduces refinement in both space and time in some predefined regions. Boundary conditions of thezoom region are provided by a coarser parent grid and the results of the zoom area are communicated back to the parent.A case study using <sup>222</sup>Rn measurements that were taken during the MINOS campaign reveals the advantages oflocal zooming.As a next step, it is investigated to what extent simulated concentrations over Europeare influenced by using an additional zoom domain over North America.An artificial ozone-like tracer is introduced with a lifetime of twenty days and simplified non-linear chemistry.The concentration differences at Mace Head (Ireland) are generally smaller than 10%, much smaller than theeffects of the resolution enhancement over Europe. Thus, coarsening of resolution at some distance of a sampling station seemsallowed. However, it is also noted that the budgetsof the tracers change considerably due to resolution dependencies of, for instance, vertical transport.Due to the two-way nested algorithm, TM5 offers a consistenttool to study the effects of grid refinement on global atmospheric chemistry issueslike intercontinental transport of air pollution

The two-way nested global chemistry-transport zoom model TM5: algorithm and applications