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0 (64/32) in this case. Information about the budgets of reduced sulphur components is less soundly based than that for oxidised S. 8. 0 16 During the last three decades, the types of fuel burned for energy in the UK have been changing quite rapidly, although the total has remained fairly constant. 5 gives the breakdown by fuel type over the period 1970–1998. Coal consumption for power generation declined rapidly in the 1990s, while domestic coal use continued the decline that had started in the 1960s.

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.

The picture is further complicated by the fact that ammonium is present in plant tissues; when the atmospheric concentration is less than a critical value (known as the compensation point), ammonia can diffuse to atmosphere from the stomata. Conversely, if the concentration is above the compensation point, then there is deposition. Hence the emission rate is influenced by plant N status, stomatal aperture and microclimate. There may be both diurnal and annual cycles, with emission being favoured after fertiliser application, during daylight and during leaf senescence, and deposition at night or when the leaf canopy is wet.

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