Air pollution is a growing concern in the area of public health. Scientific research shows that air pollutants are behind a higher number of diseases such as respiratory allergies, asthma and inflammatory conditions. It is the most vulnerable segments of populations, the elderly and children, who are the first to be affected by this phenomenon. In May 2001, the European Commission launched its " Clean Air for Europe " (CAFE) programme. This is a three-year programme intended to investigate all sources of air pollution and provide solutions to reduce them.