The presence of CO in a car park indicates that other hazardous fumes (e.g. benzene) may also be present. Due to this, the German authorities have minimized the boundaries for CO in motor vehicle parking services from 100 ppm to fifty-60 ppm, dependant upon the federal condition in dilemma. CFD https://fire-rated-ductworth-insu81233.bloggadores.com/35506281/a-review-of-car-park-ventilation