Motorcity is almost entirely covered by Deluxe. Which means there is very little sunlight actually getting into the city. So wouldn't there be a lot of Motorcity citizens suffering from severe Vitamin D deficiency as a result? Dying, even? Especially the poorer people, who probably don't have the means to get out of the city.
They've got sufficient infrastructure to grow their own food, so there are probably measures in place to make up for the lack of sunlight.
If Cyborg Dan is a politically correct cyborg, i.e. he is part robot and living organism, he might have possibly felt his face melting...