What structural modification of oxygen is an air pollutant in the lower atmosphere but beneficial in the upper atmosphere?

What structural modification of oxygen is an air pollutant in the lower atmosphere but beneficial in the upper atmosphere?

Imagine that you are the safety manager on a large construction site and are notified that an OSHA inspector has arrived at the site gate, inspection warrant in-hand, requesting access. Describe the procedures you would follow to accommodate the inspector’s request and how the inspection should proceed.