Which statement about NOx is incorrect?

The assertion that NOx (nitrogen oxides) play a role in the production of stratospheric ozone is incorrect. Stratospheric ozone is primarily formed through a different set of reactions that involve ultraviolet (UV) radiation from the sun interacting with molecular oxygen (O2). In this upper layer of the atmosphere, the key reactions leading to ozone formation do not involve NOx.

In contrast, NOx compounds, which are primarily NO and NO2, are significant contributors to the formation of ground-level ozone, which occurs in the troposphere. This process is part of a photochemical reaction involving sunlight and other pollutants, such as volatile organic compounds (VOCs). Additionally, the production of NOx occurs largely during combustion processes, which include vehicle emissions and industrial activities. Furthermore, NOx compounds can exacerbate existing respiratory problems, making them a serious health concern in urban areas.

Overall, while NOx is involved in various chemical processes linked to air pollution and health issues, its role is limited to lower atmospheric levels, rather than contributing to stratospheric ozone production.