The photo that appears on the cover of this issue of ENR, a drill rig puncturing concrete or stone at the base of a new retaining wall being built in Chattanooga, Tenn., came out on top in online voting for the image that would make the best foldout cover.

One of the most important elements in the gritty scene captured by Dylan Jones, project engineer for GeoStabilization International, is the backlit shroud of particles hanging in the air to the left side of a project superintendent. But it presented a problem for a safety manager who saw the photo. He asked ENR why we weren’t more concerned about the particles in the air and the possible health effects on the driller and others.