This figure does not include carbon dioxide emission from the combustion of international bunker fuels but includes CO 2 emission from fuelwood combustion. The comparably small reduction of sulphur emission is due to a shift in the primary energy supply sources. While the consumption of natural gas and coal has decreased significantly, the consumption of heavy fuels has remained nearly unchanged, and the combustion of wood has increased.
Transport is main source of nitrogen oxide emission.
In 1995, emissions of NO x have been calculated to be about 21 thousand tonnes, but this is a very crude estimation based on fuel consumption, total transport kilometres per vehicle type and standard emission factors. However, the technical standards of the vehicle fleet have been improving step by step at the same time. Both trends will influence the nitrogen emission balance in the coming years. The smelter in Liepaja and the cement plant in Broceni are the main industrial sources. The annual emission of dust from point sources is calculated to be about 12 thousand tonnes currently.