Feinstaub, or fine particulate matter, refers to tiny particles suspended in the air that can be harmful to health. These particles are typically less than 10 micrometers in diameter and can originate from various sources, including vehicle emissions, industrial processes, and natural events like wildfires. Exposure to Feinstaub can lead to respiratory issues, cardiovascular diseases, and other health problems. Monitoring and regulating Feinstaub levels is essential for public health, and many countries have established guidelines to limit exposure and improve air quality.