There are no corrections/adjustments for urbanization applied. We have removed a few stations (~50) which were badly affected. Most are in the USA. How we allow for urbanization is described in the paper. It is done by expanding the error range - one-sidedly. There are several papers in th IPCC WG1 Ch3 that show that urbanization isn't an issue. They are referred to. We are essentially following the conclusions of a paper from 1990.
The Royal and the Arctic
1 hour ago