Sick of cyan-blue skies

"RichA" wrote in message
...
I don't know what planet some people think we live on, or maybe it's
that some people have a restricted range of colour vision, but Earth
skies are NOT cyan, they are blue and should look blue in pictures.
As far as I know, there is no green component in the oxygen-scattering
of blue light in the atmosphere.

It can have a nasty green tinge when air quality is low - I noticed this in
London on a particularly poor air quality day.

In the tropics as the sun sets there is a green flash see: -

http://en.wikipedia.org/wiki/Green_flash

For some reason San Francisco features strongly in this article - perhaps
the influence of "sunshine"...