What are the major sources of emissions of nitrogen oxides?

Nitrogen oxides are present in combustion and industrial processes.

Explanation: We are talking about the combustion of coal, oil and gasoline by the emission of vehicles such as ships, airplanes trucks and automobiles, which is specially significant in big cities where there is more traffic . For the industry part there are the electric power plants and large industrial operation plants.

. austria-hungary began seizing british colonies in africa.

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