The following chart plots NO2 concentrations (measured by an EarthSense Zephyr) in Stanley ward during the morning of 08 October 2018:

 

The following chart illustrates how NO2 concentrations in Stanley ward have varied during recent months (- at the sites shown on the chart above underlined in red and starting with the letters KC):

Source:  based on Table D “Air Quality Annual Status Report 2016”  Royal Borough of Kensington and Chelsea (July 2017, but not yet published on the Council's website)