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I'm not surprised by the winner in this comparison.
CTA's change from diesel to hybrid and all-electric buses is making a noticeable difference. Those of you who were bike commuting 15-20 years ago when they were all diesels (and many ran very dirty) could tell stories about getting a "diesel breakfast" - a blast of dirty exhaust from a bus accelerating ahead of us.
I'd be curious to see a study on how the increase in the percentage of hybrid, electric and natural gas-powered vehicles has affected air pollution in our cities.
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