The Black Forest Fire burning near Colorado Springs has already been designated as the most destructive fire in Colorado's history, and here in the Denver Metro area we're definately seeing the result of how bad it is. It seems that the naked eye compensates a bit for the haze in the air, but I think these photos give a better idea about how much smoke and ash is actually in the air in Denver.
A view of Downtown Denver from Westminster, Colorado
Same spot, but zoomed in.
Same spot but looking towards Commerce City
Looking west towards the Rocky Mountains in Westminster, Colorado. Normally the mountains are clearly visible from here, but currently you can barely see their outline through the smoke.