Nowadays,many cities around the world have to deal with high levels of air pollution coming from different sources, such as industry or road transport. This has a significant negative impact on people health.Heart disease, lung cancer or chronic and acute respiratory diseases are examples of sickness that are enhanced by alow air quality (AQ) in the cities. Even recent studies indicate that high levels of air pollution increase the mortality rate from COVID-19. Therefore, specific action measures need to be taken in order for to maintain a healthy level of ambient AQ.