For what its worth, the English channel is the buisiest shipping lane in the world we have had light or variable winds for days with only sea breezes during the afterrnoons.
We were out on the Thames off Southend on saturday & it was busy with shipping, about 8 ships went up & down on the tide as we waited to cross the shipping channel, we could clearly see the filthy yellow smog pumping from their funnel exhausts laying spread out over the sea for miles.
In the channel this many pass every half hour 24 hours a day.
And our politicians bleat about banning diesel cars.