A diurnal classification of the local meteorology and air chemistry (O3 and NO2</) for the Swiss Central Plateau

Abstract

The relation between meteorological conditions and the daily time evolution of concentrations of air pollutants is investigated. Meteorological and air quality data are separated into five different classes depending on their diurnal variation. Considering the different frequencies of the meteorological classes and their corresponding mean concentration values over one or several years, it is possible to interpret variations of the annual mean concentrations of O3 and NO2, i.e. it helps to distinguish between the influences of meteorology and of changes of the emission situation. The frequencies and the persistencies of the classes over several years are presented and discussed. The classification also makes it possible to put case studies (like POLLUMET field experiments) into the context of the data set of several years.

Keywords

• meteorological
• air pollutants
• pollumet field experiments
• switzerland
• meteorologisch
• luftschadstoffe
• pollumet-forschungsprogramm
• schweiz