The concentrations of ambient gas-phase hydrogen peroxide were measured during the summer of 1998, 1999 and 2000. The experiments were performed in the city of Wroclaw and in the vicinity of Mount Szrenica, 1362 m a.s.l., Poland. Analysis was carried out by the chemiluminescence method. Typical mean ranges of 30 min H2O2 concentrations measured were 1.4–6.0 μg m-3 at Mount Szrenica, whereas in the urban atmosphere H2O2 concentrations were in the range of 2.7–11.7 μg m-3. In the case of the urban atmosphere, H2O2 concentrations were well correlated only with solar radiation and temperature. In the mountain air, H2O2 concentrations increased along with the increase of temperature, O3, CO and the decrease of humidity. The diurnal variation was not only caused by photochemical processes.