Going Further with Atmospheric Haze
In the below image, the eye sees the top blimp as bigger and further away than the bottom. When in fact, both of these are the same
Below is a shot looked at to consider this. So the objects in front, the white values are predominantly red and weakest in the blue. The shadows are also very flat.
Into the distance of the shots the white values are mainly blue, and have the least amount of red. Likewise, the shadows are predominantly blue.
This colouring is a result of not pollution, but the atmosphere itself. This causes the shorted wavelengths of light to bounce more- giving the blue colour.
Applying this and previous knowledge to a scene- colour levels can give this effect of depth by doing very little. Overall, on planet Earth, the further objects away- the more saturated and more blue they are, the more believable.