Study finds São Paulo switch from ethanol to gasoline dropped local ozone levels by 20%, increased CO and nitric oxide concentrations
Green Car Congress
APRIL 29, 2014
'A study by a pair of researchers at Northwestern University found that when fuel prices drove residents of São Paulo, Brazil, to switch from ethanol to gasoline in their flexible-fuel vehicles, local ozone levels dropped 20%. At the same time, nitric oxide and carbon monoxide concentrations tended to go up. The four-year study by chemist Franz M. Geiger and Alberto Salvo, formerly with Northwestern’s Kellogg School of Management and now an associate professor of economics at the National Univer
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