If you just broke a fluorescent bulb, the first thing to do is get everyone (including pets) out of the room and open a window. Fluorescent bulbs contain a small amount of mercury, about 5 milligrams in a typical compact fluorescent, which can release vapor into the air when the glass breaks. That’s a tiny fraction of what older household thermometers held (500 milligrams), but it still calls for a careful, specific cleanup process. Here’s exactly what to do, step by step.
Leave the Room and Ventilate
Get all people and pets out immediately, avoiding the breakage area as you leave. Open a window or door that leads outside, then leave the room for 5 to 10 minutes. If you have central heating or air conditioning, shut it off. Forced air can spread mercury vapor through your home’s ductwork, which is exactly what you’re trying to avoid.
Gather the Right Cleanup Supplies
Do not grab your vacuum cleaner or a broom. Both can spread mercury-containing powder into the air or grind it deeper into surfaces. Instead, collect these items before you go back into the room:
- Stiff cardboard or index cards to scoop up glass and powder
- Sticky tape (duct tape, masking tape, or packing tape) to pick up fine fragments
- Damp paper towels or disposable wet wipes for wiping the area afterward
- A glass jar with a metal lid for containing all the debris (a sealable plastic bag works if you don’t have a jar, but it won’t contain mercury vapor as well)
- Disposable gloves if you have them on hand
Cleanup on Hard Floors
Use the stiff cardboard or index cards to carefully scoop up the visible glass fragments and any white powder. The powder is the phosphor coating from inside the bulb, and it’s where most of the mercury ends up. Place everything, including the cardboard you used to scoop, directly into your glass jar or plastic bag.
Next, wrap sticky tape around your fingers (sticky side out) and press it across the entire area to pick up tiny glass shards and powder you can’t see. Put the used tape into the same container. Then wipe the whole area with damp paper towels or wet wipes and add those to the container as well.
Only vacuum as a last resort if you can still see glass fragments after completing all the other steps. Vacuuming can spread mercury-containing powder into the air.
Cleanup on Carpet or Rugs
Carpet makes things trickier because glass and mercury powder can settle between fibers. Start the same way: scoop what you can with cardboard, then use sticky tape to pull up smaller fragments. Skip the damp wipe step since it’s not practical on carpet.
If broken glass remains visible after scooping and taping, you can vacuum, but take precautions. Keep a window open, use the hose attachment if your vacuum has one, and when you’re done, remove the vacuum bag immediately. Seal it in a plastic bag. For bagless vacuums, empty and wipe the canister, then seal all the debris and cleaning materials in a plastic bag.
Here’s the part most people miss: for the next several times you vacuum that area of carpet, you should open a window, shut off your HVAC system, and close the doors to other rooms before you start. Change or empty the vacuum bag each time. After each session, keep the window open and the HVAC off for several hours. Mercury powder trapped deep in carpet fibers can get stirred up during routine vacuuming for a while after the initial break.
How to Dispose of the Debris
Seal your glass jar with its metal lid, or tightly close the plastic bag. If you used a plastic bag, get it out of the house right away since plastic won’t contain mercury vapor the way glass will. Place the sealed container outside in a trash can or protected area until you can dispose of it properly.
Many local waste agencies, hardware stores, and home improvement retailers accept mercury-containing materials. Check with your municipal waste program for drop-off locations in your area. Don’t toss the sealed debris in your regular household trash if your local guidelines say otherwise.
What About Your Clothes and Shoes
If you were standing right under the bulb when it broke and a significant amount of the contents landed on your clothing, those clothes may need to be thrown away rather than laundered. Mercury powder can contaminate a washing machine and transfer to other garments. If only a small amount of dust got on your clothes, changing and washing them normally is generally fine. Shoes that stepped directly on the breakage should be wiped down carefully with damp paper towels, and those towels should go into your sealed cleanup container.
Is One Broken Bulb Dangerous?
A single broken fluorescent bulb is not a medical emergency for most people. The 5 milligrams of mercury in a compact fluorescent is a very small amount, and a proper cleanup with ventilation limits your exposure significantly. The risk comes from inhaling mercury vapor, not from touching the glass or powder. That’s why airing out the room before cleanup is the most important step.
Symptoms of significant mercury vapor inhalation include coughing, trouble breathing, a metallic taste in your mouth, nausea, and bleeding or swollen gums. These would indicate a much larger exposure than a single bulb typically produces. If you or someone in your household does experience any of these symptoms, contact poison control at 1-800-222-1222. That line is staffed 24/7 and the experts there can assess whether further steps are needed based on your specific situation.
Children, pregnant women, and pets are more vulnerable to mercury exposure, so extra care with ventilation and thorough cleanup matters most in homes with young kids or animals who spend time on the floor.