French smog?

There was a cold fog over London today which some elements of the press are describing as French pollution, it didn't seem particularly noxious, but I guess you can't always tell, there was no sign of the Sparrowhawk, I hope that means he/she was undamaged by the pollution. Lots of very large woodpeckers and trilling long tailed tits, I heard and saw them up close today, realised the distinctive, electronic sounds come from them, they seemed almost manic and excited flitting between bramble bushes today.