• firadin@lemmy.world
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    19 hours ago

    Keep seeing this picture but no control group. Give me the same data for a French city other than Paris to understand whether this is about local policy change or about emissions standards and the move to electric cars.

    • BarqsHasBite@lemmy.world
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      18 hours ago

      Googling tells me DEF (diesel exhaust fluid) was required in 2015 in Europe. Other posters have said this graphic is NO2, which is what DEF reduces.