Comment on "Environmental implications on the oxygenation of gasoline with ethanol in the metropolitan area of Mexico City"

An exemplary paper by Schifter et al. (2001) explained environmental implications associated with the oxygenation of gasoline with ethanol in Mexico City. The study presented some secondary pollution implications of using ethanol in gasoline, derived from the increase in post-combustion acetaldehyde emissions. It also estimated in the emission inventory variation for the three ethanol fuels with respect to the emission inventory computed for the MTBE blend of year 1999. It likewise discussed the reduction of formaldehyde emissions in the case of ethanol-gasoline tested on vehicles equipped with catalytic converters. A critique of this paper is presented.