If carbon-dioxide emissions can now be reduced through use of bioethanol, is there a risk of increasing other emissions that are injurious to health?
Other emissions that are injurious to health, such as nitrogen oxides, particles, and hydrocarbons, are also lowered when you run a car on bioethanol. Modern petrol cars, however, are already so clean that these improvements are of marginal importance although, compared with diesel cars, the improvements are manifest. The only measurable emission that increases with alcohols is aldehydes. With current catalysers, however, the level is so low that this is not deemed significant.
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