Time series of Air pressure at sea level observations from the Norwegian weather station Rena flyplass (WIGOS ID 0-20000-0-01389, station ID 7950). Air pressure reduced to mean sea level. The parameter is usually called QFF in aviation and shows the measured air pressure reduced to mean sea level by applying actual atmospheric conditions. The observations have been through the data collection system of the Norwegian Meteorological institute which includes a number of automated and manual quality control routines. The number of available quality control routines is parameter dependent. Note that this is a live/dynamic dataset: New observations arrive (at a pace that depends on the station and parameter) and existing observations may be corrected (even some of the very old ones).