Mainly emitted by gasoline and diesel vehicles in Île-de-France, it impacts respiratory functions.

Particles (PM₁₀) are solid entities of very small size, harmful to respiratory and cardiovascular health.

Fine particles (PM_2,5) are solid entities of very small size, harmful to respiratory and cardiovascular health.

Formed by chemical reaction from other pollutants, low altitude ozone particularly impacts respiratory functions.

Polycyclic aromatic hydrocarbons (PAHs) are a family of air pollutants that can be present in gaseous or particulate form, and are emitted during combustion processes.

Carbon monoxide is a polluting gas which is formed during the incomplete combustion of carbonaceous materials.

Sulfur dioxide is a gaseous pollutant that is particularly harmful to the respiratory system.

Metals - nickel, lead, cadmium, arsenic, etc. - are solid particles suspended in the air, dangerous to health.

Ultrafine particles (PM_0,1) are solid entities of very small size, harmful to respiratory and cardiovascular health. Their size is between that of a virus and that of a cell.

Soot carbon refers to particles composed of carbon (a specific type of chemical composition), whose black color absorbs light radiation.

Particulate organic matter (MOP) is a type of particle with a specific chemical composition that is particularly dangerous for health.
 

Ammonia (NH₃) is a dangerous gaseous pollutant at high concentrations and in confined environments. It is also the cause of the formation of other pollutants, particles.

Aldehydes are a category of gases belonging to the family of volatile organic compounds (VOCs).

There are two types of dioxins: chlorinated and brominated, different in chemical composition, both of which are harmful to human health.

Substances used for different domestic, urban or agricultural uses, pesticides are also present in the ambient air.