Dispose of CFL bulbs at waste collection agencies, through mail-back services or by dropping bulbs off at designated retail centers, such as hardware supply stores. In certain states, it's illegal to throw away CFL bulbs in household trash.
CFL bulbs contain 4 milligrams of mercury in a sealed tube. While safe when contained, broken bulbs release mercury vapor into the air. If the bulb breaks, immediately remove pets and people from the room for 10 to 15 minutes. Ventilate the room by opening doors and windows, and turn off air conditioning or heating units. Remove glass and powder by scooping it up with a piece of cardboard and placing it into a sealed glass container. Do not vacuum the area. Dispose the sealed glass container in outdoor trash bin.