Clean air refers to air that is free from pollutants and harmful substances, making it safe for breathing. It contains a balanced mix of gases, primarily nitrogen, oxygen, and small amounts of carbon dioxide and other gases. Clean air is essential for the health of humans, animals, and plants, as it supports life and helps maintain ecosystems. Pollution can degrade air quality, introducing harmful particles and chemicals that can cause respiratory issues and other health problems. Sources of air pollution include vehicle emissions, industrial discharges, and wildfires. Ensuring clean air is vital for a healthy environment and overall well-being.