The existence of CO in a vehicle park indicates that other harmful fumes (e.g. benzene) will also be current. As a result of this, the German authorities have lessened the boundaries for CO in automobile parking amenities from 100 ppm to fifty-60 ppm, according to the federal state in dilemma. https://car-park-ventilation01122.weblogco.com/36761865/not-known-facts-about-basement-ventilation