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Couple of things happen in severe weather (or in this case smog) conditions... It is harder for the camera guys to focus and sharpen everything because there is so much more in the atmosphere than normal. Second thing is that some of the smog/fog/rain/whatever is so small and in so high quantity that the MPEG encoder/compressors can treat them like "noise" and the digital-noise-reduction filters can kick in and over-smooth things.

The DNR can be fixed/adjusted... but the cameras are pretty much stuck with what they are stuck with. The more severe the conditions, the softer the picture is likely to look.
 
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