When visibility is lowered because of fog this looks very good and realistic. The scyscrapers and mountains are slowly disappearing in a milky soup five miles ahead…
Nice! I have never seen reduced visibility in a weather condition without clouds or rain, but I know that the old retro FSX flight sim had a visibility distance slider. It is surely very easy to implement reduced visibility caused by haze, smog, humidity… even without clouds or with only a few clouds lingering in the skies.