[Exposure of children to benzene and other motor vehicle emissions]

Area of Science:

• Environmental Health
• Toxicology
• Pediatric Health

Background:

• Urban environments with high traffic density are associated with increased air pollution.
• Exposure to pollutants like benzene, toluene, and lead can have adverse health effects.
• Carboxyhemoglobin (COHb) levels can indicate exposure to carbon monoxide, a common traffic-related pollutant.

Purpose of the Study:

• To compare blood concentrations of specific pollutants and COHb in children from urban and rural settings.
• To investigate the association between living in a high-traffic urban area and elevated pollutant levels in children's blood.

Main Methods:

• Venous blood samples were collected from children in a high-traffic urban area (Cologne, FRG) and a rural reference area (Borken, West-Germany).
• Concentrations of benzene, toluene, lead, and the percentage of carboxyhemoglobin (COHb) were measured in all blood samples.
• Statistical comparison of pollutant levels between the urban and rural groups was performed.

Main Results:

• Children residing in the urban area exhibited significantly higher average concentrations of benzene, toluene, lead, and COHb compared to the rural reference group.
• Specifically, urban children had 71% higher blood benzene and 56% higher blood toluene levels.
• Median values for urban/rural groups were: benzene (115/70 ng/l), toluene (545/370 ng/l), lead (5.2/4.7 µg/dl), and COHb (0.9/0.6%).

Conclusions:

• Higher blood levels of benzene, toluene, lead, and COHb in urban children are linked to increased atmospheric pollutant concentrations in high-traffic urban environments.
• This study highlights the impact of traffic-related air pollution on children's exposure to harmful substances.
• Findings underscore the need for strategies to mitigate urban air pollution and protect child health.