Is there open data on Diesel exhaust (NOx or soot), comparing a number of the same cars

  • on the road
  • in the test lab ?

What I want to do is plot the correlation: if road NOx is around say 2 times test lab,
legislators could use test lab data and scale limits by this ratio, here 2.
(Or is this common practice and I just don't know it ?)

The German Umweltbundesamt (Environment Agency) collects hourly data on NOx, ozone etc. at several hundred places in Germany. It seems that their web query GUI can export only one-hour .csv s, but the nice people there have sent me data for whole years, which can be read with pandas and plotted like this:

enter image description here

Also, from EEA Europe one can download 48-hour files for European countries -- not terribly useful for long-term studies.

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