this post was submitted on 17 Jan 2025
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Zero context. The first 3 could be peek traffic hours on a day with high heat and no wind. And the fourth a Sunday during some national event that people watched on TV, while a storm blows away most of the pollution.
Or they could be completely fake, as there is no source stated.
A complete lack of context it's a pretty worthless, very low effort post IMO.
Edit:
Thanks for the downvotes, because linking the source would have been Soooo difficult. /s
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.
There were also the Olympics, and the French put in a lot of effort to make Paris as appealing as possible.
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.