Breathing is indeed the main route of exposure to outdoor pollutants. Of course, air pollution affects the elderly, children and people with an already existing condition more violently, but it does not spare healthy people, who may develop heart or lungs diseases as a result of a strong exposure to pollution. The main outdoor air pollutants
are fine particles, ozone, sulphur dioxide, nitrogen dioxide and carbon monoxide. Ozone is the main component of urban smog, as it comes from automobile exhausts and power plant emissions, and its inhalation can lead to respiratory difficulties. Although fine particles are present in a smaller quantity, they are not less harmful than ozone. As a matter of fact, the very small size of these particles is what makes them dangerous, as they bypass the body’s natural defenses and can get deep into your lungs.