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Environmental Issues.

3) High temperature combustion (as in petrol and diesel engines)
produces toxic gases in addition to carbon dioxide.

High temperature combustion of fossil fuels causes
nitrogen in the air to react with oxygen producing toxic gases.

nitrogen + oxygen  arrow  nitrogen monoxide.
N2(g)  +  O2(g)       arrow          2NO(g)

As well as being poisonous, nitrogen monoxide is a greenhouse gas.
It also reacts with water and oxygen in the air to form dilute nitric acid.
This contributes to acid rain.

Petrol and diesel engines also produce poisonous carbon monoxide
and release unburnt hydrocarbons.

All of this pollution is produced at ground level, mainly in cities where
road vehicles gather. The obvious solution is to fit road vehicles with
electric motors rather than petrol or diesel engines. One day this will happen.
In the meantime, exhausts are fitted with catalytic converters
in an attempt to minimize road vehicle pollution.

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