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Taxes
and charges are very good incentives in reducing emissions in general. Green
purchasing of transport services and vehicles is another way to keep emissions
low. Legislation enabling cities to introduce restrictions for heavy duty
vehicles has helped reduce Nox emissions
in the three largest Swedish cities by up to 8 % in the respective zones.
Replacing the 200 old diesel city buses by CNG buses in
Malmo, Sweden, has reduced the Nox emission from the buses by 60 %.
One of the combined power and heating plants,
Heleneholmsverket, in the district heating system in Malmo has a total power of
500 MW. It has gradually been converted from oil heating to natural gas
heating. Before that the oil burners were converted to low-Nox
burners which reduced Nox emissions by 30 %. Then the major part of
the oil was replaced by natural gas which reduced Nox emissions by
30 %.
In the next step condensation of
the fuel gases was introduced and this reduced the existing NOx
emissions by another 30 % to a level about 40-50 mg/MJ |