Can Fees on Polluting Cars Clean the Air? London Has New Evidence: The city’s expanded low-emissions zone, which was politically fraught, has cut emissions that contribute to health problems

They did present the data on the measured* levels and changes over the period, tables 43 and 44. And table 45 shows the observed trend and the counterfactual that they estimated in order to estimate the impact. (as womble pointed you can’t measure an impact outside of a laboratory on something with complex influences, because you can’t measure the counterfactual).

They don’t want to attribute the whole meaasured improvement in air quality to ULEZ, as some of the change should attributed to other influences or pre-existing trends.

of course you just can’t measure 100% of the air in a place accurately without asphyxiating the people in it, so they use data from an array of detectors sampling the air at regular intervals.

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