The presence of CO in a car park implies that other dangerous fumes (e.g. benzene) may also be present. As a result of this, the German authorities have lessened the boundaries for CO in vehicle parking amenities from one hundred ppm to 50-sixty ppm, according to the federal condition in https://basement-ventilation92234.snack-blog.com/36678553/basement-ventilation-can-be-fun-for-anyone