It travels all over Europe depending on the wind. There is just extra pollution around Paris (mostly because of traffic) so the two of them combined can make it

It travels all over Europe depending on the wind. There is just extra pollution around Paris (mostly because of traffic) so the two of them combined can make it exceed noticeable thresholds. Another example of a recent particulate matter concentration map : http://www2.prevair.org/sites/prevair.org/files/styles/scald-prevair-dnd/public/thumbnails/image/episode_europe.png?itok=4wajkc7W http://www2.prevair.org/sites/prevair.org/files/styles/scald...