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oheffendi t1_ja7cw7c wrote

Reply to comment by ECatPlay in If the fuel that goes in car engines is extracted from hydrocarbons, which consist of only Hydrogen and Carbon, and those hydrocarbons react with Oxygen in the air (combustion reaction), to produce CO2 and H2O, why do we get a bad smell from car exhaust fumes if both gases are odorless? by Protoflare

Many diesel cars, who traditionally have been the stinkiest of the bunch now use a special additive known by the trade name AdBlue (urea solution ) to help reduce NOx emissions. My car uses it and the reduction of the smell is quite noticeable.

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