Try this on for size: https://cdn.theatlantic.com/static/mt/assets/science/lastwinterthiswinter.jpg https://cdn.theatlantic.com/static/mt/assets/science/lastwin

Try this on for size: https://cdn.theatlantic.com/static/mt/assets/science/lastwinterthiswinter.jpg https://cdn.theatlantic.com/static/mt/assets/science/lastwin... from this following article: https://www.theatlantic.com/technology/archive/2013/01/aghast-over-beijings-air-pollution-this-was-pittsburgh-not-that-long-ago/267237/ https://www.theatlantic.com/technology/archive/2013/01/aghas... The left image is, amazingly, a daytime shot - the sun is visible in the top-left corner. The smog was so bad on that day ("Black Tuesday", November 1939) that a camera essentially could not capture any detail _in broad daylight_.