There was a bushfire quite some fair way away from where I live, around Christmas 2005, but lots of the smoke drifted over and gave us some spectacularly, and quite spooky end-of-the-world looking yellow/orange coloured sky, and a vivid red sunset. The colours in these pictures are fairly accurate, though the exposure is rather poor (the camera just doesn't have the range).
As I recall, much of that day the sky was a strange murky yellow–brown colour, and, of course, meant everything else got tinged that way, making it look like you were in part of some science-fiction movie. It was much more colourful than the sky during a dust storm. Later on in the afternoon, quite a bit before sunset, it got very orange. Then by sunset we had vivid red skys.
These photos were taken using a Polaroid PDC1320 digital still camera, and it really doesn't do justice to what you could see at the time.