Full-text search

Home Content Area

Home Navigator

End Navigator

Graphics of annual values NABEL

The National Air Pollution Monitoring Network (NABEL) measures air pollution levels at 16 locations with varying pollution situations in Switzerland and monitors the development over the past few decades.

Graphics in high resolution
07.05.2014 | 6857 kB | ZIP

Contact: luftreinhaltung@bafu.admin.ch
Last updated on: 23.05.2014

End Content Area

Full-text search

Compilation method for time series data

Time series data older than 1990 often exhibit gaps of a certain length. As pollutant concentrations vary considerably throughout the year, theses gaps cannot be simply ignored. The data series were therefore completed as follows: the monthly averages were calculated, then the missing monthly averages were obtained by linear regression of data series from another measuring station exhibiting similar variation over time, and finally, providing there were at least at least four valid monthly averages available for the station, the yearly average was then calculated from these values. Isolated gaps in the data series of the stations of Basel-Biningen (NO2) and Dübendorf (SO2) were interpolated directly by linear regression of the yearly averages.The Bern measuring station had to be moved in 1997, though it remained along the same thoroughfare hemmed in by tall buildings. The resulting inconsistencies in the time series were corrected (see Annex 5 of the NABEL Annual Report).