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in the at mo sphere over south ern Po land. Geo log i cal Quar terly, 58 (4): 673–684, doi: 10.7306/gq.1163 An over view of long-term, sys tem atic ob ser va tions of trace gas com po si tion of the at mo sphere over south ern Po land is given. Three ma jor green house gases (CO2, CH4, N2O) and se lected halocarbons (freons F-11, F-12 and F-113; chlo ro form; 1,1,1-trichloroetane; car bon tet ra chlo ride; sulphur hexafluoride and trifluoromethyl sul phur pentafuoride) were mon i tored. Mea sure ments were per formed at two lo ca tions of con trast ing char ac ter is tics: (1) the high-moun tain site Kasprowy Wierch, High Tatras, rep re sent ing at mo spheric con di tions rel a tively free of lo cal in flu ences, and (2) two sites lo cated in the Kraków ag glom er a tion, rep re sent ing a typ i cal ur ban at mo sphere. The data avail able for Kraków and Kasprowy Wierch were com-pared with the Mace Head data, rep re sent ing a ma rine re gional back ground. The im pact of con ti nen tal sources for some of the mea sured gases is clearly seen in the Kraków and Kasprowy Wierch re cords. The mean off set be tween CH4 con cen tra-tions re corded at Kasprowy Wierch and at Mace Head for the pe riod 1998–2012 is 20.7 ppb and stems from con ti nen ta

geological quarterly

Anthropogenic changes of CO2, CH4, N2O, CFCl3, CF2Cl2, CCl2FCClF2, CHCl3, CH3CCl3, CCl4, SF6 and SF5CF3 mixing ratios in the atmosphere over southern Poland