There has been another one of those mysterious radiation plumes drifting into and over Europe from the east. It appears to be coming from Russia. It is reportedly low level harmless radioactive particles and they are slowly drifting over the parts of Europe some people remember fondly. We remember who started using gas in the First World War. They must have made a study of the prevailing winds.
You know what else gets distributed by the prevailing wind? Airborne pathogens developed in a weapons lab like the one that unleashed the Wuhan Corona virus. Same thing, just a little more tricky to trace back to the point of origin if you do it right. The prevailing winds are a factor few consider outside the realm of those who race sailboats competitively or study naval war in the Age of Sail.