First — tell the workforce that there will be a CONTEST and the prize will be a ***CASH*** bonus!

Second, explain that the contest is safe, fun, and everybody can play. The rules are simple: When you smell something, say something. The first person to correctly _identify_ the aroma and _pinpoint_ its source WINS!!! There can be *multiple* winners. Sources pinpointed to proper exhausts during proper operation win a consolation prize. Workers who smell nothing get to share a prize-pool worth one month worth of the savings after the leaks are identified & fixed. There are no losers!

Then — add a dose of several potent odorants to the compressed air and wait…

In a short time, there should be a flurry of activity. Then the leaks can be repaired. A rooftop leak like this one might have taken a while for the “cloud” to find a receptive nostril, but even lack of evidence is evidence of something.

P.S. Don’t use the same odorant the gas company uses else there will be chaos. Try Lemon, Spearmint, Cinnamon, Chanel No5, Peach, use your imagination. Not recommended for technical or high-purity air systems, but those systems should have inherent controls in place already.

Enjoy!