Nitrogen oxides (NO and NO2) are emitted primarily during combustion processes which involve coal, oil, gas, wood, waste and engines. But they are also generated during industrial processes and in agriculture. Pinpointing pollution sources and then measuring substance emissions such as nitrogen oxides can pose major problems for cities and municipalities. But this is exactly what is needed in order to be able to predict air pollution from nitrogen oxides and develop strategies for their reduction. Moreover, according to national and international conventions such as the Kyoto Protocol, countries must specify how high their greenhouse gas and air pollution levels are. The data is documented in what are known as emission inventories.
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