Air pollution - Why care? (France)

The gases and fine particles in polluted air have harmful effects on human health and the functioning of ecosystems. Each individual breathes in around 15 000 litres of air every day and this air must be clean.

Nitrogen dioxide (NO₂), sulphur dioxide (SO₂), polycyclic aromatic hydrocarbons (PAHs), volatile organic compounds (VOCs), benzene, ozone (O₃) and particulates are harmful to the lungs and may trigger serious illnesses. Persons suffering from respiratory problems are particularly sensitive to any deterioration in air quality.

Pollutants emitted into the atmosphere can also affect the functioning of ecosystems, for example by combining with rainwater (acid rain).