Content

Near Ground Ozone 1992

Methodology

The low measuring point density and above all the specific chemical behavior of ozone allow no extensive depiction of the emission loads as is possible with other air pollutants (cf. Maps 03.01, 03.03, 03.04 SenStadtUm 1994a-c).

The somewhat complicated connections between generation and decomposition of ozone in the different layers of the atmosphere as well as its effect on living and inanimate environment are elucidated in the schematic depiction of Map 03.06.1.

Production and destruction of ozone as well as the action of this pollutant gas are greatly dependent on the respective weather conditions. There are considerable differences between summer and winter months. To record the typical course on days with high solar radiation and thus good conditions for photochemical ozone formation, only the days with maximum temperatures over 25 °C, so-called summer days, were considered. Due to the very distinctive daily cycle for ozone and the strong influence of spatially very different nitrogen oxide emissions on the ozone concentration, the consideration of temporal and spatial median values makes little sense. This is evident from the example of four measuring points in the Map 03.06.2.

The measuring points in Berlin where the standard values were exceeded in 1992 are presented in Map 03.06.3.

High ozone concentrations in the near ground atmosphere can be caused both locally as well as nationally. With the help of two successive days with high ozone loads from summer 1992, the different influences are elucidated in Maps 03.06.4 to 03.06.6.