over reaction
When Mnt St Helens erupted, the ash went around the globe and affected the weather for 2 years but there were not similar restrictions. I understand the BA 747 Flight 9 flew into a thick cloud of ash – rather than the diluted CAVOK conditions we have today.
If 1ppm (or whatever) is enough to shut down all airspace, then the situation will continue for months or a year – because that ash will remain in the northern hemisphere.
Volcanos have erupted before and this action has not been taken before. I am unaware of any incidents except of those flying directly into dense cloud.
It is getting ridiculous. Airfreight is not moving. Airlines will go bust. People will lose their jobs. People will go bankrupt as their bank balances & credit card credit disappears and up to 1 million people will not be able to vote in the election.