"Every human inhales 14 kg of air each day, while drinking just 2 kg of water and eating 1.5 kg of food. Air is therefore an essential component for life, and most citizens are strongly preoccupied with its quality. With each breath, we inhale necessary oxygen, but also small amounts of potentially harmful gases and small particles. These constituents directly affect our health, even if we might not be aware of it. Research shows that adverse health effects do not only result from acute events but also from chronic exposure, reducing human life expectancy by more than eight months on average and by more than two years in the most polluted cities and regions worldwide (COPERNICUS/ESA)."