Dust is often light in color, while soot from fires is generally dark. What would happen to the amounts of solar radiation reflected and absorbed if a large amount of light-colored dust was added to the air? What if a large amount of dark soot was added?
In both cases, you would not be able to see distance objects clearly, due to scattering. Light-colored dust will scatter sunlight more effiently, and much of it will get through anyway, but from all directions. Think of what happens on a cloudy day. Scattered sunlight makes the entire cloud white. Light gets through but you cannot see the sun.
Dark soot will darken the entire sky.