I watch european Purple Air monitors just out of curiosity. Day after day the area around Milano is in pretty bad shape, related to PM 2.5. One of the few areas of western nations where this consistently bad air pollution is still tolerated
Interesting, and unfortunate that some will dimiss hard data provided by the sensors. I wonder how much is related to geography too, with it seeming like all the bad air seems to stack up against the Alps. Right across them in Switzerland, it’s often excellent air.
Almost certainly a Foehn wind from north of the Alps. Have you come across this weather site? Cartina dati in diretta - Centro Meteo Lombardo worth having a look at. Around 500 Davis weather stations.
Ah, nice, interesting to see, thanks. Maybe you meant that the Foehn brings clean air to northern Italy sometimes (but seems rare), which makes sense.
The past few days, PM values in northern Italy are the typical high compared to the rest of western europe. Although as mentioned previously, the whole Adriatic area is higher, and as usual, Bosnia is much worse then everywhere else.
I hope the image above shows properly. These are the minimum relative humidity values for the 24th of March 2024. A Foehn wind it was… the values are very very low indeed. Virtually all of them below 50%