A replacement analyser was installed at the Oxford Street monitoring site on Friday 13th May. Although the existing analyser was currently operating well, Westminster City Council has installed a newer one to reduce the likelihood of future equipment faults following a failure at the beginning of the year.

The official data set for this high profile site now originates from this newer unit, but the original one will be run alongside, as a cross check, for several months.

Item date 19/05/2016