Taken from the June 2005 Which mag, the figures are concentration of particles in the air. The World Health Organization thinks particles pose the biggest health threat of all air pollutants
By 2010, the government wants the levels to be a max of 18 in Scotland, 23 in London and 20 in the rest of the country
Answers are as follows:
Birmingham 30
Buckingham Palace 29
Which office London 28
Leeds 27
Bristol 26
Cardiff 25
Brighton Pier 25
Manchester 24
Stonehenge 21
Lands End 18
Snowdonia 17
Balmoral 13
John o'Groats 12
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