Westphalia). The evaluation of 50 mobile measurements within the investigation area at distinct times between 2002 and 2005 has shown that the urban CO2 mixing ration cannot only be represented temporarily but also spatially. The method of mobile measuring
offered statistically valid results which supply a recurring pattern of carbon dioxide distribution. These recurring CO2 patterns are presented in the article ; they can be viewed as a basic component of mobile air quality measurements. - (IFL)