Effect of atmospheric pollution on the respiratory system

Santiago de Chile has a high level of air pollutiom with ozone (O3), carbon monoxide (CO) and particles equal of smaller than 16 mum (PM(10)) usually exceeding the accepted standards. This situation should be noxious for the exposed population and particularly -in the case of O3 and PM(10-) for the respiratory system. However, such an effect is rather difficult to demonstrate and it depends on the type of population under study.