[OldNavyVet]

The Los Angeles SMOG problem was horrendous before additives like ethanol were added to that area's gasoline.

Check it out at http://green.autoblog.com/2012/08/22/la-smog-has-less-of-a-chokehold-than-years-ago-noaa-study-says/

[Minutemen]

The air in Los Angeles got considerably cleaner way before the introduction of alcohol in the gasoline. Smaller,lighter cars, more efficient internal combustion engines were the real reason.