Pollution II - USA - School Buses May Foul Air for Many Years
New York,NY,USA -New York Times, by ANTHONY DePALMA .Oct 11, 2005: -- New York City's fleet of 6,200 yellow school buses is the largest in the country by far. And despite recent efforts to clean up the most polluting buses in the fleet, it may still be one of the dirtiest... by the fact that the buses are owned not by the city, but by outside companies, they've thousands of buses more than a decade old, and some more than two decades old - powered by diesel engines so old that the most effective new exhaust filters simply do not work properly... The Metropolitan Transportation Authority has reduced the age of its fleet substantially over the last five years and cut emissions by 85 percent. The privately owned school bus fleet is not being replaced anywhere near as quickly. Instead, the owners are upgrading them by installing pollution-trapping catalysts and filters... Combined with a new type of diesel fuel that contains very little sulfur, the most effective filters can reduce harmful pollutants by 95 percent... But experts say, and city officials concede, that the most advanced filters do not work on pre-1996 buses because their engines cannot be controlled electronically...
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