There is smoke coming from 100's of buildings in the city areas. You have a lot of dust kick up from flying low to the ground. You have contrail smoke that lingers in the air forever. When i drop my bombs and shoot my guns i wanna see a BOOM-SPLAT-POW, not a firecracker.
I watched a video on the tube of a CAS mission were there was a group of US soldiers pined down by a large enemy force and moving in on them. They had no smoke, flares or anything to mark themselves, just a radio. Flight lead from an F-16 group caught a glimpse of were the enemy force was, and dropped a cluster bomb. With the Dust from that explosion the rest of his flight new were to look, and the soldiers on the ground could tell them were they needed to go from there.