Sulphur Dioxide (SO2)
Sulphur dioxide (SO2) is produced when a material, or fuel,
containing sulphur is burned. SO2 is a colourless gas. It can be
oxidised to sulphur trioxide, which in the presence of water vapour
is readily transformed to sulphuric acid.
Globally, much of the sulphur dioxide in the atmosphere comes from
natural sources, but in the UK the major contributors are power
stations (65% of the total emissions). Sulphur dioxide levels in
this country have dropped considerably over recent years due to
cleaner power stations and a decreased use of coal. Also reduced
levels of sulphur in vehicle fuels have helped bring about a lower
level from transport emissions.
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