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@ Bianchi; actually it is true. Once your cat converter gets hot, the exhaust is usually cleaner than the ambient air. Yes, there is C02 and carbon monoxide, but after all when you are biking you are producing c02 as well.
Diesels are an exception. More particulate matter. Gasoline engines produce ultra-fine particulates as well.

Of course, if your cat isn't hot enough, or otherwise broken, that is a problem, but almost all cars made in the past 15 years are very very clean.

I wish WMATA would use more natural gas buses, which don't pollute at all, but the trend seems to be towards diesel-electrics. Don't really understand why.

(I disagreed that today pollution should be a factor given that today's cars pollute very little ... )

Lance, your notion that cars don't "pollute" ignores greenhouse gas emissions, which the Supreme Court and EPA say are pollutants. Cars are a very large contributor to greenhouse gas emissions.

by hugo on Jun 10, 2010 1:47 pm • link • report

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