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chiph
on May 7, 2015
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25% of Cars Cause 90% of Automobile Air Pollution
The common term for such vehicles is "gross polluter". Here's a study on them (pdf warning)
http://www.csus.edu/indiv/s/shafizadehk/pubs/UT2004.pdf
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Search:
http://www.csus.edu/indiv/s/shafizadehk/pubs/UT2004.pdf