I should take some pictures these days. I´ve read somewhere (I cannot remember where..) that the colouring of the sunset depends on the smog in the atmosphere. A good deal of smog means more colourful sunset. But I am not sure about that. It´s just stuck in my mind. Some interesting article about sunset: http://en.wikipedia.org/wiki/Sunset.
And here is the picture of the sunset not from my window (in the city) but from holiday on August last year when we stayed in the quite unspoiled nature of the mountains: