Environmental Defense Fund: ‘Ask Dr. John’ - School Bus Pollution and Health

Every day, half a million school buses safely carry 24 million American children to school, field trips and athletic events.

Unfortunately, most buses are powered by diesel engines that actually pollute the air inside the bus. Studies show the pollution gets trapped inside the bus, where kids breathe it in.

Dr. John Balbus, EDF’s chief health scientist, answers common questions about school bus pollution and your child’s health.

Q: I don’t see billowing clouds of black smoke behind the school bus. Does that mean the bus exhaust is clean?

Unfortunately, it’s not that simple. Even clean-looking exhaust from tailpipes, and from the engine itself, can contain small particles and other toxic pollutants that can get inside the school bus, and in children’s lungs.

Q: How does diesel pollution get inside a school bus?

Diesel pollution can enter a school bus from both the tailpipe and the engine. In school buses, the engine is in the front, right near the door, so every time the door opens, engine and tailpipe exhaust get sucked inside.

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