We have had clear skies for a while now, however I have been in a place near the lakes where the air always seems to be better. In that area the 'war machine' does low-flying test flights, and there is the atomic Sellafield station.
Once I came back further south we just seem to be getting normal contrails.
I'm hoping the 'black ops' budget runs out asap so we can breathe, and our plants can flourish.