The presence of CO in a car park signifies that other hazardous fumes (e.g. benzene) are present. As a result of this, the German authorities have reduced the bounds for CO in automobile parking amenities from a hundred ppm to 50-sixty ppm, based on the federal point out in problem. https://car-park-ventilation34467.blog2news.com/37059538/the-definitive-guide-to-car-park-ventilation