Pollutants and greenhouse gases concerned

The pollutants and greenhouse gases covered by CITEPA's inventories for the transport sector are presented in the table below:

Pollutants concerned Environnemental Effet/Impact
SO2, NOx, NMVOCs, CO, NH3 Acidification, eutrophication, photochemical pollution
CO2, CH4, N2O, HFCs Enhanced of the greenhouse effect
As, Cd, Cr, Cu, Hg, Ni, Pb, Se, Zn Heavy metals contamination
Dioxins/furans (PCDD-F), PAHs*, PCB, HCB Persistant organic pollutants contamination
Total suspended particules (TSP), PM10, PM2,5, PM1,0, Black carbon (BC) Particulate matter

*sum of 4 PAHs : benzo(a)pyrene, benzo(b)fluoranthene, benzo(k)fluoranthene et indeno(1,2,3-cd)pyrene


Main emission sources

The transport sector includes several activities: road sources (passenger cars, light duty vehicles, heavy duty vehicles (including buses and coaches) and motorised two wheeled vehicles) and non-road sources non (aviation, inland waterways, maritime et railways). Emissions come from fuel combustion , as well as gasoline evaporation and abrasion (brakes, tyres, road, trolley wires).

The full list of sources considered for the « transport » sector is available on this website, on the SECTEN page, section « List of sectors and sub-sectors by SECTEN category », by uploading the associated file.

Emission trends data for the « transport » sector by sub-sectors are available and downloadable on this website, on the SECTEN inventory page, section « Sub-sector contribution by air pollutant and greenhouse gas ».

The SECTEN report, available free of charge only in online reading on this website for CITEPA members, provides a sector analysis for each pollutant et greenhouse gas to understand the data and the factors influencing the trends observed, inclunding regulatory framework (read the SECTEN report online via your login and password).

ExampleLes émissions de CO sur la période 1990-2014 ont très fortement baissé (-93%). L’année 2014 représente le niveau le plus bas observé depuis 1990. Cette diminution s’observe sur l’ensemble des sous-secteurs.
La baisse globale des émissions de CO de ce secteur s'explique essentiellement par la mise en place des catalyseurs dans les véhicules du transport routier, ... (to read more, consult the SECTEN report online via your login and password).



The pollutants and greenhouse gases inventories made by CITEPA are produced in an objective and impartial manner.

All the methods used to produce those pollutants and greenhouse gases inventories are explained and detailed in the OMINEA report, made by CITEPA. A database including the activity data and the emission factors applied is also available on this website.

These methods, used for the estimation of both pollutants and greenhouse gases, are internationally accepted methods. Concerning the pollutants, the methods applied are consistent with the EMEP methodology, and concerning the greenhouse gases, with the GIEC methodology.

CITEPA is annually audited by international experts (UNFCCC and UNECE) in order to control these methods are properly applied.