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Thursday 17 April 2014 • 19:05 GMT • Last update 16:46


NOx is the term used for emissions of nitrogen oxides (NO and NO2) from an internal combustion engine.

NOx reacts with airborne oxygen and moisture to produce smog and acid rain.

NOx emissions go up when combustion temperature is high. Using exhaust gas recirculation can reduce combustion temperatures and hence reduce NOx emissions.

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