The existence of CO in a car or truck park indicates that other harmful fumes (e.g. benzene) are also existing. Because of this, the German authorities have minimized the boundaries for CO in automobile parking amenities from one hundred ppm to 50-sixty ppm, depending upon the federal condition in concern. https://dantetkzob.wssblogs.com/36366872/indicators-on-car-park-ventilation-you-should-know