How are nitrogen oxides produced and their environmental impact?

Nitrogen oxides (NOx) are primarily produced through combustion processes, particularly in vehicles, power plants, and industrial facilities, where high temperatures cause nitrogen and oxygen in the air to react. These gases contribute to the formation of ground-level ozone and smog, leading to respiratory problems and other health issues. Additionally, NOx can lead to acid rain, which harms ecosystems, soil, and water sources. Overall, their environmental impact is significant, affecting air quality and contributing to climate change.