The presence of CO in a car park implies that other harmful fumes (e.g. benzene) can also be present. On account of this, the German authorities have lessened the limits for CO in car parking facilities from one hundred ppm to fifty-sixty ppm, according to the federal point out in https://car-park-ventilation90112.blog2freedom.com/36655469/the-fact-about-basement-ventilation-that-no-one-is-suggesting