I fear, this is one of those things where everybody is mathematically correct but all results are different.

To "diffuse light through air", you need; Correct : you need air.

Air, and its pollution, moisture, pressure, density, do not exist in the digital world.

A digital world is a vacuum. = No air, no pollution.

THE thing missing in the digital artificial world is :"The air we all breath".

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!