Indirect greenhouse gases

Carbon monoxide (CO), nitrogen oxides (NOx) and other volatile organic compounds than methane (NMVOC) contribute to the greenhouse gas effect by forming ozone (O3) and/or carbon dioxide (CO2) or nitrous oxide (N2O) in the atmosphere. Greenhouse gases formed from such compounds in the atmosphere are referred to as indirect greenhouse gases in the greenhouse gas inventory. CO, NOx and NMVOC emissions are restricted under other international agreements, such as the Convention on Long-Range Transboundary Air Pollutants, and they are not subject to the reduction targets of the Paris Agreement, for example. However, their emissions are also reported in the greenhouse gas inventory and emissions of indirect greenhouse gases are taken into consideration in total emissions.