Environmental Health Criteria 214

HUMAN EXPOSURE ASSESSMENT
of mean concentrations of carbon monoxide inside and outside the
vehicle was 1 : 1, and the ratio of mean concentrations inside the
vehicle to a fixed-site location was about 5. The ratio of in-vehicle
concentrations under three different driving conditions, urban/
interstate/rural, was roughly 3.3 : 2.8 : 1. An investigation of
carbon monoxide concentrations inside private and public transport
vehicles in Mexico City in 1993 (Fernandez-Bremauntz & Ashmore,
1995a,b) found an average ratio of in-vehicle : ambient concentrations
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