Abstract
The exposures of automobile toll booth collectors in the Boston area to selected air contaminants were monitored during the four seasons from 1972 to 1974. The highest carbon monoxide concentrations were found at the in-city toll booths and the highest lead levels at the surburban booths. Biological monitoring for carbon monoxide and lead exposure were closely related to airborne contaminant levels. The study supports the need for environmental control for toll booths located at busy highway and tunnels.