Mick85, I understand.
For a commercial operator or a private hire certainly something to be taken very seriously.
But operations with the aim to aid those in peril, like SAR and HEMS have another cost/benefit analysis. Certainly the engines would suffer (how much? we don't really know as we know nothing about the concentration levels, especially at low altitudes) but would that be worth it if you can save a life?
Which does not mean you have to risk 3 to 6 lives to save one, but that is why a responsible crew should have the option of weighing the information and make sensible decisions. Mitigate the ever present risks is what it is all about.
I just think that blanket restrictions usually are very shortsighted and stupid.
And aviation seems to suffer more and more from them.