One of the conclusions is that urbanized temperature stations are almost a waste of time in climate study:
"For the purpose of assessing climatic change, a 'rural' environment needs to be carefully defined. Climatic temperature trends can only be assessed from rural sites which have suffered no major transformations due to changes in shelter or urbanisation, or from sites for which the records have been made homogenous. Urban environments usually suffer continual modifications due to one cause or another."
Wow. The study quoted is hard to get to, being a .pdf link embedded within a .pdf, so I'll link it here.
h/t Ace of Spades' daily AGW roundup ..... you are reading it, aren't you?!
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