view of church `staint nedelya` with fine particulate matter air in the city and pm 2.5 dust, and air pollution in sofia, bulgaria

aerial air allergy bad building bulgaria business capital carbon cathedral church city cloud concept dangerous dioxide dust environment europe fine fog haze health landmark landscape matter metropolis mist nedelya orthodox outdoor particulate pm2 pneumonia polluted pollution problem protection quality respiratory smog smoke sofia staint toxic unhealthy urban view weather