I suspect this would be very poorly received.

It would be one thing if there was a safety concern directly connected to the workplace, say folks failing to use hearing protection while operating loud machinery, or wearing headphones and listening to loud music while in a work situation that required full attention to the environment. But here you seem to be focusing on a hazard that is relatively well known, very much a matter of personal choice, and with no real connection to the workplace. Are you also going to have safety moments urging your co-workers not to eat so many sweets, and not to drive to work? Both of those activities have significant health risks too. Why focus on the volume of your co-workers headphones?

Companies that provide health insurance for their employees do sometimes provide health education and information. They arguably have skin in the game since they are paying for some portion of their employees health care. Even then, these are sessions almost always voluntary, "if you are interested" activities. You proposing to grab 5 minutes from a captive audience on a topic where you have no real standing to speak. Most folks would just ignore it, but some of your co-workers might start regarding you as a busybody with too much time on your hands.

I suspect this would be very poorly received.

It would be one thing if there was a safety concern directly connected to the workplace, say folks failing to use hearing protection while operating loud machinery, or wearing headphones and listening to loud music while in a work situation that required full attention to the environment. But here you seem to be focusing on a hazard that is relatively well known, very much a matter of personal choice, and with no real connection to the workplace. Are you also going to have safety moments urging your co-workers not to eat so many sweets, and not to drive to work? Both of those activities have significant health risks too. Why focus on the volume of your co-workers headphones?

Companies that provide health insurance for their employees do sometimes provide health education and information. They arguably have skin in the game since they are paying for some portion of their employees health care. Even then, these are sessions almost always voluntary, "if you are interested" activities. You're proposing to grab 5 minutes from a captive audience on a topic where you have no real standing to speak. Most folks would just ignore it, but some of your co-workers might start regarding you as a busybody with too much time on your hands.