| # | Clue | Answer As Given | Value | Round | Category | Air Date | Show |
|---|---|---|---|---|---|---|---|
| This protective layer of the stratosphere can be depleted by the release of refrigerants & other chemicals | ozone | $400 | J | SCIENCE DIGEST | 2020-10-21 | #8263 | |
| This form of oxygen, O3, is a major source of air pollution | ozone | $200 | DJ | SCIENCE | 1996-09-10 | #2762 | |
| The symbol of this form of oxygen that screens the Earth from ultraviolet rays is O3 | ozone | $400 | J | SCIENCE | 1991-06-12 | #1578 |