Data on pollen is very valuable for many scientific questions relating to climate change, ecology and allergology. This data is analysed according to European standards by analysts at the Medical University of Vienna. At the Biologische Station Neusiedler See, a so-called pollen trap is used, which is positioned on the roof of the station and is maintained on a weekly basis. Air is sucked in and pollen particles adhere to a rotating adhesive film, allowing not only the detection of certain pollens, but also their temporal classification. This makes this method suitable for determining the pollen count and pollen forecasting.

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The Florence urban station of the Ximeniano Observatory is located in the city center of Florence, Tuscany, Italy and it has been measuring eddy covariance fluxes of momentum, energy and CO2 since 2005. The overlap between the footprint area and the high-resolution land use map reveals that urbanized areas represent the outmost fraction of the footprint (> 94%) with respect to urban green areas that are almost absent (< 6%).

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The station Font-Blanche is located in south-east France on a limestone plateau. The site is a mixed Mediterranenan forest, by Pinus halepensis Mill. and Quercus ilex L.

The Lettosuo station (ICOS code FI-Let) is a nutrient-rich peatland forest (originally a fen-type peatland), located in southern Finland, few kilometers from highway 2. The site was drained for forestry in 1969 and partially harvested in March 2016. After drainage, the stand has developed to a mixture of Scots pine (Pinus sylvestris L.) and pubescent birch (Betula pubescens Ehrh.) in the d

The measuring site is located 100 m east of Arctic Station, Qeqertarsuaq, at a mesic heath tundra, Osterlien. Arctic Station is a permanently manned research station operated by the University of Copenhagen on Disko Island, West Greenland. The eddy covariance and climate stations has been operated since 2012, with minor changes in the configureation and setup.

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The site of Toulouse (code ICOS FR-Tou) is located in southwestern France, in the city of Toulouse, over an experimental field at the premises of Meteo-France. The vegetation consists of a grassland cut at least once a year. The city of Toulouse is located in the semi-oceanic climate