Essential Chemistry for IGCSE - Air And Water (Section 5 - No. 27)
Which of the following processes contribute to the formation of nitrogen oxides in the atmosphere?
Photosynthesis by plants
The combustion of fuels in vehicles and industrial processes
The condensation of water vapor in the atmosphere
The emission of ozone from the stratosphere
Explanation
The text explicitly states that the combustion process at high temperatures is a source of nitrogen oxides.
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