Abstract
In an area where temperatures below 0°F are prevalent for many weeks, motor vehicle repairs and servicing take place in enclosed spaces protected from the cold. Unless adequate precautions are taken, it may be expected that garage and service station operatives will be exposed to carbon monoxide from the motor vehicle exhaust gases. Carbon monoxide hemoglobin estimations were carried out on blood specimens from more than 350 individuals employed at urban and rural service stations. The results show that exposures to excessive concentrations of carbon monoxide are infrequent and that cigarette smoke is normally a more significant source of carbon monoxide than motor vehicle exhaust gases.