Study of the color composition of Cairo sky under the influence of pollution

Abstract EN

Cairo streets lacks the pure clean color due to the air pollution in a way that there is a colored layer of grey color on the sky and on the buildings, as i knew that Cairo sky is polluted and inclined to grey color however i saw the color of sky in other countries through television, and i was more astonished when i saw the same view on one of the important and greatest city in the united states which is supposed to be more polluted due to the industrial evolution and the development of life style, therefore i got in mind that Cairo sky is clearly polluted and i decided to know about the rate of change and magnitude of pollution through the study of color.

when i was in visit of the museum of modern art in Cairo, i found out through the paintings of Egyptian artists within the fifties and sixties of last century clear colors in the painted sky and which would net came to my mind if i think about painting Cairo sky actually.

what are the differences in color under the impact of pollution and what is the original blue color in Cairo sky.