It all depends on how much light you are talking about. If you need to have the lighting generated inside a house be sufficient to light it up, you'll quickly run into complications with fogs as you describe. Depending on whether the nebula scatters or not, you may find issues that walls are actually darker than open areas, because they block the glowing and reflect less light than they would have emitted if they were open.
That being said, look up. Look at our beautiful blue sky. It is actually the thing you describe. The blue light is caused by sunlight being scattered by molecules and dust particles in the air. Each cubic meter of air that is exposed to sunlight actually "glows" in all directions, and the cumulative effect of 100km of that glowing air is the blue light you see. And, like the issue I mentioned above, the sky is typically brighter than the ground, especially when the ground isn't being exposed to direct sunlight. This often surprises novice photographers who don't understand why they cant capture their subject and the blue sky behind them in the same picture.
When professional photographers are shooting against the sky in this way, they often rely on a reflector to reflect enough light onto the front of the subject. Obviously this would not work in your world, but if you're wondering why professionals can shoot against the sky, that's why.
The trick to this, of course, is that the amount of scattering is quite small. It takes the cumulative effect of 100km of air glowing in this way to create the blue sky we see. If you have a large amount of brightness being generated per cubic meter, you get effects like godrays, which do obscure the background: