People, pollution and profits

THE buses that take our children to school should be safe places. But according to John Wargo, a professor of environmental risk analysis and policy at Yale University, they are polluted by diesel exhausts.

Riding the buses with monitors, Wargo and his colleagues discovered that children were at "significant risk" from tiny particles of half-burnt diesel fuel sucked in through doors at bus stops or belched out by the bus in front. At its worst, when lines of idling buses dropped off and picked up students at schools, the pollution caused "a burning sensation at the back of the throat", he says.