All most all of Germany's Air Ambulance use the PW. The one in Berlin (I think) even has airfilters.
DRF and ADAC mostly PW, the orange and blue ones of Federal Police are T2i ( TM ).
Berlin ( Christoph 31 ) is equipped with sandfilters:
Christoph 31 testet Sandfilter (ergänzt) | rth.info - Faszination Luftrettung | Rettungshubschrauber online
skadi