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17
CH3041
LONDON SMOG II
• For 5 days in London
in Dec.
1952 the air particle
load reduced
light intensity during mid-day to
0.1% of normal, visibility < 30m,
light intensity during mid-day to
0.1% of normal, visibility < 30m,
4mg m-3 SO2, 6mg m-3 particles
• 1 week later 4000
people had died.
• Deaths were not
due to high [SO2] but rather
to the inhalation of highly acidic particulate
matter + SO2 - a synergistic effect.
to the inhalation of highly acidic particulate
matter + SO2 - a synergistic effect.
• The presence of
high [CO]
& [SO2] means
that these fogs are reducing smogs.
that these fogs are reducing smogs.
• Stationary
sources of combustion are the
main sources of 1o pollution. It is now found
in cities such as Prague, Krakow, Shanghai.
main sources of 1o pollution. It is now found
in cities such as Prague, Krakow, Shanghai.
