A total of 18 VisionAir BlueLine DustFree were commissioned between May and November 2022 – first in Brake near Bielefeld, then in Düsseldorf and now in Cologne-Mülheim. Measurements are still being carried out at the sites. Particulate matter levels are falling sharply, says Stefan Schlottbom, to less than half of what they were before the air cleaners were commissioned.
The biggest challenge, says Schlottbom, was finding a place for the air cleaners, “because the corridors in the signal box are very narrow. But the air purifier fits right in.” Some staff initially complained that they took up space and were in the way. Thanks to the wheels, the units could easily be pushed back. “The units are not very noisy in use, air conditioning is much louder,” says Schlottbom. “They are not disruptive in terms of noise at all.