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Obic production of NO is thought to dominate overall. Guesstimates based on rather sparse data suggest that UK soil production of NO may be equivalent to 2–5% of the production from fuel combustion. 10 gives the detailed Department of Environment (DoE) statistics for the UK emission of nitrogen by fuel combustion in 1970 and 1998. The annual total is less than for sulphur dioxide, with a different balance between source types. Power stations make up only a fifth; while road transport, which contributed only a tiny proportion of the SO2 emissions, contributes nearly half of the N emissions.

Fuel cleaning. The coal used in large-scale generating plant is ground in a ball mill to the texture of a fine powder so that it can be blown down pipes and mixed with air before combustion. 9 Calcium carbonate FGD system. Source: Johnsson, J. E. (1998) ‘Urban sources of air pollution’, In: J. Fenger, O. Hertel and F. Palmgren (eds) Urban Air Pollution: European Aspects, Kluwer Academic Publishers, Dordrecht, The Netherlands. physically-distinct particles having a different density to the coal, a process such as froth flotation can be used to separate the relatively dense flakes of pyrites from the powdered coal.

Husar, J. D. and Husar, R. B. (1999) ‘Estimating historical anthropogenic global sulphur emission patterns for the period 1850–1990’, Atmospheric Environment 33: 3435–3444. sphere, and most of the human SO2 from fossil fuel emissions in the northern hemisphere, we also have a geographical split. Note that the emission strengths are given as mass of sulphur, not of sulphur dioxide. 0 (64/32) in this case. Information about the budgets of reduced sulphur components is less soundly based than that for oxidised S.

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