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Engine exhaust in public transit buses has been associated with health effects. This pilot study examines the toxic nature of these engine exhausts under different idling conditions. The emission tests on public buses were performed with two different fuels: the ultra low sulfur diesel (ULSD: Bus 536) and 20% Biodiesel (BD) mixed with ULSD (B20: Bus 506). Particulate matter (PM) was collected from...
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