Stikstofoxiden, commonly known as nitrogen oxides (NOx), are a group of gases that include nitrogen dioxide (NO2) and nitric oxide (NO). These gases are produced during combustion processes, such as in vehicles and power plants. They play a significant role in air pollution and can contribute to the formation of smog and acid rain. Exposure to stikstofoxiden can have harmful effects on human health, particularly for individuals with respiratory conditions. Additionally, these gases can harm the environment by affecting ecosystems and contributing to climate change. Efforts to reduce NOx emissions are important for improving air quality and public health.