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Confined spaces become hazardous areas when exhaust gathers from cars, trucks, buses, tractors, trailers, forklifts, and other fossil fuel burning engines. Exhaust fumes are highly toxic and exposure to the fumes can result in serious health problems, and even death. That is why the CO and NO2 levels must be measured, and when concentrations reach unsafe, unhealthy levels, the areas must be ventilated. Reliable detection can also protect those who work in these areas from accidents like explo …