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Underground garages create urgently needed parking spaces in densely built-up cities. In the underground car parks, which are often several storeys deep, the air quickly becomes enriched with exhaust gases from petrol and diesel engines. Even when ventilation is available, gas detection devices have to be used to monitor carbon and nitrogen oxides in underground car parks so that health risks to people are minimised. GfG offers transmitters with dual sensors and suitable controllers for this purpose.
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