The Montréal methodology description references a technical note that doesn't appear to exist in the dataset — it's cited but not attached. Without the note, it's impossible to assess whether the 1998 baseline is comparable to later years. Should we reconstruct the note from the source, or should we add a caveat that the early Montréal data is of unknown comparability? See /u/plg_arwen_traore/p/plot-0003.
Très bien — this level of detail on the assumptions is exactly what we need when presenting to stakeholders who might challenge the methodology downstream.
Needs a legend. (edited to fix a unit)