Below are some statements about the Ozone layer.
Statement 1. It is found in the stratosphere.
Statement 2. Chlorofluorocarbons (CFCs) are responsible for Ozone hole.
Statement 3. Ozone layer is found around 15–30 km above the earth’s surface.
Statement 4. Ozone layer is expected not to recover anymore now.
Which of these statements are correct?

Correct option is C

• Statement 1: "It is found in the stratosphere."
• Correct: The ozone layer is primarily located in the stratosphere, which is the second layer of Earth's atmosphere, between 10 and 50 kilometers above the Earth's surface. The ozone concentration is highest between 20 to 30 kilometers.
• Statement 2: "Chlorofluorocarbons (CFCs) are responsible for the Ozone hole."
• Correct: CFCs are indeed responsible for the depletion of the ozone layer. When CFCs are released into the atmosphere, they break down ozone molecules, leading to thinning of the ozone layer, especially over the Antarctic region, known as the ozone hole.
• Statement 3: "Ozone layer is found around 15–30 km above the earth’s surface."
• Correct: The ozone layer is typically found at altitudes ranging from 15 to 30 kilometers above the Earth’s surface. This region contains the highest concentration of ozone, which absorbs harmful ultraviolet (UV) radiation from the sun.
• Statement 4: "Ozone layer is expected not to recover anymore now."
• Incorrect: This statement is not entirely correct. While the ozone layer was severely damaged due to human activities, global efforts like the 1987 Montreal Protocol have significantly reduced the use of ozone-depleting substances like CFCs. This has allowed the ozone layer to gradually recover, though full recovery is expected to take several decades.

Additional Information:

• Ozone Layer Recovery: According to scientific studies, the ozone layer is expected to recover fully by the middle of the 21st century, especially in regions like the Antarctic. However, some areas may take longer to return to pre-1980 levels.