Recently there were news about changes in the limits to air travel due to ash in the air. The limits were changed from 100 micro-grams per cubic meter to 2000 micro-grams per cubic meter, 20-fold increase !
Now, in the news, they are saying that temporarily at least, airplanes can fly through much denser ash clouds (although I haven't seen the numbers yet).
Also in the news recently, was a discussion that even with the strict limits, in some cases ash was seen on the inside of the jet engines. Although not enough to stop them.
I hope that with "milder" limits, the check-ups and cleaning of engines is also increased drastically.
This will though cost money, and the reason for "milder" limits seems to be mostly driven by the pressure of the travel industry (?).
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