Google Answers: How much cleaner have cars become over time?

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Q: How much cleaner have cars become over time? ( No Answer, 0 Comments )

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Subject: How much cleaner have cars become over time?
Category: Science > Technology
Asked by: mjsx-ga
List Price: $5.00

Posted: 20 Jun 2005 13:51 PDT
Expires: 20 Jul 2005 13:51 PDT
Question ID: 535213

I'm looking for a graph or table showing how much cleaner cars have
become (pollution-wise) over time.  (Say from the 1960s until now.) 
Data for the five or ten best selling passenger cars of each year in
the US (or average thereof) would be fine.

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