The concentration of B[a]P in Ostrava–Radvanice increased in the period 2003–2007. The district pediatrician simultaneously observed the increased incidence of asthma bronchiale in children from 10% in the year 2001 up to 30% in the year 2007. It became the reason to study the impact of air pollution to human health in this region more thoroughly, under the project Program Ostrava.