Examples of the importance of trace gas measurements in the Milan ozone plume

The production rate of ozone depends in a non linear way on NOx = (NO + NO2 ) and VOC (Volatile organic carbon compounds). The analysis of the sensitiv ity of the ozone production is a prerequest to formulate effective abatemen t strategies. Analysis of the sensitivity question can be based mainly on t wo approaches: a) Observation based modelling and b) Chemical transport mod els. Both ways need a comprehensive data set of gaseous trace compounds in order to successfully address the question.