Answers are grounded in this paper and cite their sources.
Examination of traffic policemen in Sydney showed that those exposed to motor vehicle emissions had blood lead levels within normal limits but marginally higher than those unexposed. Carboxyhaemoglobin levels depended only on cigarette smoking and were unrelated to exposure to motor vehicle emmissions.
No takes yet. Share an insight, caveat, or question.
Bisby et al. (1977) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: