While concrete dust can be gray or white, all the shots of the bridge show orange to reddish dirt and gravel sized and larger concrete rubble.
If he had been near the blast, he should be pretty chewed up by the small rocks.
Plus, he is the wrong color of dirty--should be some reddish dirt in there.
.....They must have a pretty big sack of gray make up dirt.....
It's called Portland cement and comes 94 pounds to the bag.
The Green Helmet Guy needs to get a better make up crew if he is going to play the victim's role.
Second, he is better as a director or rescue man ( with clean hands ) posting for the repeated camera shots...