25% of cars are causing 90% of car pollution

25% of cars are causing 90% of car pollution

- Old clunckers to blame


A study by researchers at the University of Toronto found that 25% of cars and trucks are causing about 90% of pollution from the vehicle fleet. The scientists made measurements of 100,000 vehicles as they drove past air-sampling probes on one of Toronto’s many major roadways. The bottom 25% of the vehicles studied emitted: 95% of soot 93% of carbon monoxide 76% of benzene, toluene, ethylbenzene and xylenes
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