Smog is hated when it's on the ground, but it turns out that smog can also be trapped in a layer, above the earth but below the clouds. In this case the space shuttle Discovery took this shot, in which the great lakes and finger lakes are shining from reflected sunlight. The good news is that the smog condition is probably temporary, as smog needs pretty good conditions to form, as well as sunlight. The bad news that in all its forms it does create health hazards. The ground-level smog is bad, but the smog above is also thought to be bad because it reflects UV rays.