| Noble gas |
| Inert gas |
| Dense gas |
| It's a gas |
| Cellar gas |
| Deadly gas |
| A noble gas |
| Lead source |
| Harmful gas |
| Densest gas |
| Gas element |
| Element #86 |
| An inert gas |
| Odorless gas |
| Colorless gas |
| Unhealthy gas |
| Hazardous gas |
| Dangerous gas |
| Poisonous gas. |
| Heavy noble gas |
| Gaseous element |
| Dreaded element |
| Scary noble gas |
| Troublesome gas |
| Radioactive gas |
| Atomic number 86 |
| Household hazard |
| Dangerous seepage |
| Dangerous element |
| It ends up as lead |
| Unhealthy emission |
| Homeowner's hazard |
| Heaviest inert gas |
| Home health hazard |
| Dangerous emission |
| Heaviest noble gas |
| Radioactive element |
| Gaseous element, Rn |
| Dangerous inert gas |
| Homebuyer's concern |
| Dangerous noble gas |
| Unwelcome house gas |
| Hazardous inert gas |
| Home buyer's concern |
| Gas in a uranium mine |
| Heavy gaseous element |
| It's noble and a gas! |
| Step in uranium decay |
| One of the noble gases |
| The heaviest noble gas |
| Very dangerous element |
| Cause of some poisoning |
| Gas tested for in homes |
| Heaviest ofnoble gasses |
| Home testing kit target |
| Dangerous household gas |
| Invisible health hazard |
| Hazardous household gas |
| Household health hazard |
| Home inspector's concern |
| Gas derived from uranium |
| Product of uranium decay |
| Danger in a uranium mine |
| Dangerous gaseous element |
| Odorless household hazard |
| Gas tested for in the home |
| Inert gas — adorn (anag) |
| Invisible household hazard |
| Gaseous radioactive element |
| Household inspection target |
| Heaviest of the noble gases |
| Concern for many a homeowner |
| Gas of concern to homeowners |
| Gas that can devalue property |
| Gas that glows when condensed |
| Part of the uranium decay chain |
| Undesirable element in the home |
| Way cool, using deadly gas!" (5) |
| Colourless gas, atomic number 86 |
| Product of radium disintegration |
| Gas checked in home safety tests |
| Gas that basements are tested for |
| Gas that home inspectors check for |
| Radioactive gas, linked to granite |
| Subject of a house inspection test |
| Gas that can doom a home inspection |
| Gas that's a household health hazard |
| Chemical element linked to lung cancer |
| Element tested for in home inspections |
| It's often measured in housing inspections |
| Element next to astatine on the periodic table |