That photo needs more explanation. There is more to that scene than just leaf blowers pushing something around. Those folks may be following a ‘bleach spray’ truck ... any more info on the photo, Travis?
Travis seems to be quiet on his explanation of the photo. I saw the video of the men using, what Travis thinks are yard blowers, spraying down an area with a liquid sanitizer. On their backs are black tanks filled with the chemical. You pump up the tanks with air with a built in pump like any yard sprayer.