this post was submitted on 17 Jan 2025
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[–] 8uurg 43 points 16 hours ago* (last edited 13 hours ago) (3 children)

Reading the annotations on each of the plots, these are all average NOx concentrations of the labelled year, not point measurements - as you are insinuating. Furthermore, the color scales match up too. (edit) Do note: the more recent plot is zoomed in though and scales are much less clear!

I think it is fair to say that recent policy changes, like rejecting private vehicles from the center and promoting active transportation work. Though aftereffects of COVID (work-from-home) may be a contributor too.

[–] [email protected] 9 points 15 hours ago* (last edited 15 hours ago)

Since the graphic measures NOx emissions, this is mostly about diesel vehicles, older than Euro 5 or Euro 6 specifically. Also, while researching this I found out that starting this month, all diesel vehicles are banned in Paris.

[–] [email protected] 8 points 16 hours ago (1 children)

There were also the Olympics, and the French put in a lot of effort to make Paris as appealing as possible.

[–] [email protected] 1 points 4 hours ago

We're looking at 15 years of data encapsulated in 4 annual averages. If they put in that kind of effort for the sake of the Olympics, well, good on them for playing the long game.