Which one of the following statements about air pollution caused by diesel engines is correct ?
It produces large quantity of carbon monoxide at lower and high temperatures
It produces large quantity of nitrogen oxides at lower and high temperatures
It produces large quantity of carbon monoxide at lower temperature and nitrogen oxides at high temperature
It produces large quantity of nitrogen oxides at lower temperature and carbon monoxide at high temperature
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UPSC CAPF – 2017
Combustion in diesel engines produces various pollutants, including Carbon Monoxide (CO) and Nitrogen Oxides (NOx). CO is a product of incomplete combustion and is more prevalent when combustion temperatures and efficiency are lower, such as during engine start-up, idling, or low load conditions (lower temperatures). Nitrogen oxides (primarily NO and NO2) are formed at high temperatures and pressures when nitrogen and oxygen in the air react. Therefore, NOx production is significant at high engine loads and speeds, where combustion temperatures are high. Statement C correctly reflects this pattern: higher CO production at lower temperatures and higher NOx production at high temperatures.
Diesel engines produce more CO under conditions of incomplete combustion (often at lower temperatures) and more NOx under conditions of high temperature and pressure (often at high engine loads).