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World’s “bluest” sky is in Brazil (2006)
- zeristor 6y agoThe sky around London seldom gets that blue compared to that in Denmark, it would appear that the sky near Rio is the bluest. This is more of a puff piece, one off trials on hazy days, and none of the pictures compare to the depth of blue I’ve seen in some skies. Reverse engineering it I’d think about what increases blue intensity, or decreases and work out where the optimum place might be.
- madaxe_again 6y agoDepth of atmosphere, density of particulate matter are the two things that would affect Rayleigh scattering the most. Being on the east coast in the Southern Hemisphere puts you in the way of prevailing winds carrying very little pollution.
- ZeroClickOk 6y agoI'm Brazilian, and in 40 years I lived in different cities there: Recife, Maceio, Rio de Janeiro and now in Brasilia. Interesting thing is, I think the sky from Brasilia is more blue than other cities... is this maybe because of the altitude? Recife/Maceio/RJ are from 0 altitude, but Brasilia is 1000 meters.
- terramex 6y ago> is this maybe because of the altitude? I had similar thought when I visited Lake Titicaca (3812m surface elevation) and looked up while standing on a small hill on the shore - the sky had super deep blue shade at the zenith, even at noon. Very uncanny, I'd not seen anything like that before or since. I guess it was a combination of lower air density, high altitude, little air pollution and great horizon distance letting me notice contrast between white sky in the distance and dark blue sky right above. Last point would explain why I have never seen this effect in even higher mountains.
- _ZeD_ 6y ago"Brazil" where? It's huge :) in figure 4 there is a comparison between San Francisco, Los Angeles and 22 nations... I'm italian, born and lived in Bari and now in Milan, and I assure you that the color of the sky is really different between the two cities (~800km apart each other)
- thunderbong 6y agoI get that this is a scientific publication, but I think a photo of the sky would be nice!
- kelsolaar 6y agoThere is one: https://i.imgur.com/HuE82K0.png https://i.imgur.com/HuE82K0.png
- kelsolaar 6y agoAnyone has the full scientific report? The Wayback Machine PDF link is seemingly broken: http://web.archive.org/web/20080517201411/http://www.npl.co.uk/blueskies/ http://web.archive.org/web/20080517201411/http://www.npl.co....
- kelsolaar 6y agoI actually just found it here: https://eprintspublications.npl.co.uk/3518/ https://eprintspublications.npl.co.uk/3518/
- hawaiian 6y agoI'm surprised they didn't test Hawaii. The sky looks pretty blue from here.