Vehicle exhausts—major contributors to polluted air—are detrimental to children's health, as epidemiological and experimental evidence reviewed by Grigg in Archives of Disease in Childhood shows.

Diesel exhaust particles—a carbon core plus any number of adsorbed high molecular weight substances—are the primary particles in polluted air. Particulate matter (PM), comprising coarse, ≤10 μm (PM₁₀); fine, …