The presence of CO in a car or truck park implies that other harmful fumes (e.g. benzene) are also existing. Because of this, the German authorities have lowered the boundaries for CO in automobile parking amenities from one hundred ppm to fifty-60 ppm, based on the federal state in question. https://milovnbre.madmouseblog.com/17192432/getting-my-basement-ventilation-to-work