Apparently, both particulate air pollution and streetlights are both capable of this.
http://blogs.discovermagazine.com/crux/2012/08/23/why-is-the-night-sky-turning-red/
Apparently, both particulate air pollution and streetlights are both capable of this.
http://blogs.discovermagazine.com/crux/2012/08/23/why-is-the-night-sky-turning-red/