Ethanol: Not the Answer
LATimes:

"Ethanol is being promoted as a clean and renewable fuel that will reduce global warming and air pollution," said Mark Z. Jacobson, an associate professor of civil and environmental engineering and author of the study in the online edition of Environmental Science and Technology. "But our results show that a high blend of ethanol poses an equal or greater risk to public health than gasoline, which already causes significant health damage."

Ozone is a key ingredient in smog, and when inhaled even at low levels it can harm lungs, aggravate asthma and impair immune systems.