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 ?)

1 Answer 1


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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