[Nitrogen oxides emissions arising from commercial energy consumption in China].

According to national and provincial energy consumption and specific NOx emission factors for different sectors and fuel types, NOx emissions resulted from commercial energy consumption in China in 1990's were presented. Specially, NOx emission inventories by provinces, sectors and fuel types in 1997 were developed and discussed. Total NOx emissions increased from 8.4 Mt in 1990 to 12.0 Mt in 1996. However, compared with the peak value in 1996, NOx emissions in 1997 and 1998 decreased by an amount of 0.34 and 0.82 Mt respectively. It can be seen remarkable imbalance of NOx emissions by fuel types, economic sectors and provinces: 3/4 of the totals came from coal burning; sectoral emissions were dominated by industry (39.56%), power (36.74%) and transportation (11.22%); NOx emissions in Hebei, Jiangsu, Liaoning, Shandong, Shanxi, Guangdong, Henan, Heilongjiang and Hubei province exceeded 0.5 Mt, while those in Qinghai, Ningxia and Hainan were lower than 0.1 Mt. Regions with highest NOx emission intensities (> 10 t.(km2.a)-1) were Shanghai, Tianjin and Beijing municipality. In sum, NOx emissions and pollution mainly concentrated in the populated and industrialized areas of China: the Eastern Central and Southeastern provinces.