New study says just 25 percent of cars to blame for more than 90 percent of pollution image

Numerous researchers have been pointing out that the older the vehicle, the more likely it would emit more harmful emissions than a new car would in a few weeks time.

A new study coming out of Canada has even set out to gauge the level of pollution difference between a rusty, beat-up junker and today’s fuel efficient vehicles. The research took to monitor traffic in the center of Toronto, with scientists at the end revealing that a quarter of the measured cars were responsible for no less than 95 percent of particulate and 93 percent of carbon monoxide emissions. “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,” commented study author Greg Evans. The researchers of the University of Toronto took on-the-spot measurements of the exhaust of no less than 100,000 vehicles – passing besides air sampling probes that adorned Toronto’s busiest roads.

The researchers than had confirmation that small batch of vehicles – the old or badly tuned – were the producers of the vast majority of pollution. The 25 percent of vehicles were responsible for 95 percent of black carbon – a particulate often associated with lung diseases; 93 percent of carbon monoxide emissions and 76 percent of benzene, toluene, and other volatile organic compounds that are well known carcinogens. They also saw pollution is most severe on highways and other types of congested roads.