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Nitrogen oxides (NOₓ) are a group of highly reactive and toxic gases monitored worldwide due to their harmful effects on both health and the environment. They are primarily generated during high-temperature combustion, with major sources including vehicles, power plants, and industrial processes.
NOₓ is often visible as a brownish gas and contributes to the formation of ground-level ozone and smog, both of which degrade air quality and harm human health. It also plays a key role in the development of acid rain, which can damage ecosystems, soils, and water resources.



