Ozone has 2 syllables and the stress is on the first syllable.
| # | Sentence | |
|---|---|---|
| 1. | The current ozone hole area is still large compared to the 1980s, when the depletion of the ozone layer above Antarctica was first detected. This is because levels of ozone-depleting substances like chlorine and bromine remain high enough to produce significant ozone loss. | |
| 2. | First detected in 1985, the Antarctic ozone hole forms during the Southern Hemisphere’s late winter as the returning sun’s rays catalyze reactions involving man-made, chemically active forms of chlorine and bromine. These reactions destroy ozone molecules. | |
| 3. | Thirty years ago, the international community signed the Montreal Protocol on Substances that Deplete the Ozone Layer and began regulating ozone-depleting compounds. | |
| 4. | The ozone hole over Antarctica is expected to gradually become less severe as chlorofluorocarbons—chlorine-containing synthetic compounds once frequently used as refrigerants – continue to decline. Scientists expect the Antarctic ozone hole to recover back to 1980 levels around 2070. | |
| 5. | Unlike its presence at high altitude where ozone acts as Earth's sunscreen from harmful ultraviolet radiation, at low altitudes, ozone is a health hazard contributing to respiratory problems like asthma and bronchitis. | |
| 6. | The 1987 international Montreal Protocol banned many of the chlorine compounds used in refrigerants and aerosols, like hairspray, to lessen the damage. Since then, the size of the ozone hole has slowly declined but remains large enough to produce significant ozone loss. | |
| 7. | Scientists studying data from a European Space Agency (ESA) satellite say they have observed a strong reduction in ozone concentrations over the Arctic, creating what they are calling a “mini-hole” in the ozone layer. | |
| 8. | In a global response to protect the ozone layer, 197 nations signed the Montreal Protocol in 1987 to phase out use of ozone-depleting chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs). | |
| 9. | Without the ozone layer, we would be in danger. | |
| 10. | Even if we do this, it will be another sixty years before the Antarctic ozone hole is repaired. |