"Scientists have made a surprising discovery about ethanol: The more it was used by drivers in Sao Paulo, Brazil, the more ozone they measured in the local environment.
The finding, reported this week in Nature Geoscience, is contrary to other studies predicting that increased use of ethanol would cut levels of ground-level ozone, or smog."
http://www.latimes.com/science/sciencenow/la-sci-sn-ethanol-ozone-levels-brazil-20140501-story.html#page=1
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