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Explanation and Answer:
At normal temperatures oxygen and nitrogen don't react together. But at high temperatures, nitrogen oxides are formed during combustion from the oxygen and nitrogen present in the atmosphere. The major sources of NOx in the atmosphere are: burning of fossil fuels to generate electricity or to move vehicles and heavy equipment.
When the NOx are emitted into the atmosphere they can be transported by wind and air currents long distances. Acid rain is produced when the oxides of nitrogen react with the water of the rain. They produce a mixture of nitrous and nitric acid.