Air temperature and humidity, wind speed and direction, pressure, precipitation, sunshine duration, global radiation, surface radiation budget. Parameter measured/observed: Ozone, sulphur dioxide, nitrogen oxides, carbon monoxide, carbon dioxide, methane, particulate matter (PM10, PM2.5, PM1), heavy metals (As, Cd, Hg, Ni, Pb), PAH, VOC, EC/OC. Observational Network: Austrian background air quality monitoring network according to the Austrian Ambient Air Quality Act and Ozone Act Stations: Enzenkirchen, Illmitz, Klöch, Pillersdorf, Sonnblick, Vorhegg, Zöbelboden