Ethanol may be causing elevated air pollution in Brazil, scientists report in a peer-reviewed study. The study may have public policy implications in the United States, where federal law requires the transportation fuel mix to contain approximately 10 percent ethanol.

Ethanol may be causing elevated air pollution in Brazil, scientists report in a peer-reviewed study. The study may have public policy implications in the United States, where federal law requires the transportation fuel mix to contain approximately 10 percent ethanol.