Carbon dioxide (CO2)
CO2 arises from the burning of fossil fuel and results in a net increase of the gas in the atmosphere. This is believed to be linked to the global climate change. The emission of CO2 is directly related to the energy output of the engine and thus also to its fuel consumption.

Nitrogen oxides (NOx)
NOx – in the form of either NO or NO2 – form during combustion when oxygen (O2) reacts at high temperature with nitrogen (N2) in the air. If we lower NOx, fuel consumption (CO2) goes up, and vice versa. Important engine technology developments in recent years have enabled Scania to lower emissions without an adverse effect on fuel economy. NOx contribute to the formation of ozone and smog at ground level, as well as acidification and eutrophication or over-fertilisation.

Particulates (PM)
PM in exhaust gases consist of fine, solid particles of carbon (soot) that are formed in low-oxygen areas of the combustion flame, i.e. incomplete combustion. Unburned hydrocarbons and sulphur in low-quality fuel increase particle content. PM is harmful to the respiratory system when inhaled.

Carbon monoxide (CO)
CO is found in very small quantities in diesel emissions. CO is a toxic substance formed as a result of incomplete combustion.
 
Hydrocarbons (HC)
HC are foul-smelling residual products of combustion. HC contribute to the formation of ozone and smog at ground level.