I've watched a perfectly blue sky this morning slowly deteriorate into
a mess of criss-cross contrails / chemtrails, haze and cirrus.

Could someone enlighten me as to the genuine reason behind this - I
always thought it was down to water vapour condensing from jet engines
- but as I look up some of these contrails stop and start. The old
fashioned contrails were just continuous lines across the sky.

It has been suggested that during the volcanic flight ban the skies
were far bluer than usual - but I thought this was down to a very
clean, dry airstream from the north-west.

Further suggestions as to the reason are explained in this Daily Wail
article which includes a theory that these chemtrails consist of
chemicals that calm the population down?

http://www.dailymail.co.uk/sciencete...-sunshine.html