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Re:25% of Cars Cause 90% of Automobile Air Pollution by organsnyder on Thursday May 07, 2015 @12:50PM (#9506443)
Michigan actually has rather poor-quality air: http://www.stateoftheair.org/2015/states/michigan/

Much of this is due to us being down-wind of Chicago: http://www.epa.gov/med/grosseile_site/indicators/air-polluti...

Re:25% of Cars Cause 90% of Automobile Air Pollution by danans on Thursday May 07, 2015 @05:52PM (#9508574)
Sure, it isn't the Canadian Rockies, but it is nothing like a bad day in San Bernadino or Bakersfield. Check out the summer AQI maps for different parts of the country at http://www.airnow.gov/ (site is down right now).

I remember visiting LA from MI when I was a kid in the 80s and "tasting" smog in the air for the first time. Admittedly LA has gotten a bit better since then.