Fuel Smarts

Study: 25 Percent of Cars Create Most Air Pollution

May 13, 2015

Photo via Wikimedia Commons.
Photo via Wikimedia Commons.

The majority of vehicle pollution is produced by a small number of older or "badly-tuned" cars and trucks, according to a study by researchers at the University of Toronto in Canada.

The study measured the emissions of 100,000 vehicles as they drove past air-sampling probes of the university's main laboratory on College Street, a major roadway in Toronto.

According to the findings, 25 percent vehicles on the road produced 95 percent of black carbon (or "soot"), 93 percent of carbon monoxide, and 76 percent of volatile organic compounds such as benzene, ethylbenzene, toluene, and xylenes, some of which are known carcinogens.

"As we looked at the exhaust coming out of individual vehicles, we saw so many variations. How you drive, hard acceleration, age of the vehicle, how the car is maintained – these are things we can influence that can all have an effect on pollution," said study author Greg Evans.

The findings were published in the March edition of the journal Atmospheric Measurement Techniques.


  1. 1. Paul [ May 19, 2015 @ 09:16AM ]

    California should remove their heads from their rectal cavities and realize the same result. Ca. truckers are screwed because CARB made a bunch of rules based on research done by an imposter and even after he was proven to be a fraud, they STILL went ahead with the regulations based on this phony research. Small trucking companies have been put out of business by the hundreds because of this B. S.. Only in California...run by liberals...ruined by liberals.


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