World Ozone Day is observed on:

• 5th June

• 16th September

• 22nd April

• 10th December

The ozone layer is mainly found in:

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

The international treaty to phase out ozone-depleting substances is:

• Kyoto Protocol

• Paris Agreement

• Montreal Protocol

• Rio Declaration

The ozone layer protects us from:

• Infrared

• Ultraviolet (UV)

• X-rays

• Gamma rays

The major cause of ozone depletion is:

• Carbon dioxide

• Chlorofluorocarbons (CFCs)

• Methane

• Nitrous oxide

The chemical formula of ozone is:

• O₂

• O₃

• CO₂

• NO₂

The ozone hole is mainly observed over:

• Arctic

• Antarctica

• Tropics

• Himalayas

The Vienna Convention (1985) focused on:

• Climate change

• Ozone layer protection

• Desertification

• Biodiversity

The Montreal Protocol was signed in:

• 1985

• 1987

• 1992

• 2000

Which is considered “good ozone”?

• Tropospheric ozone

• Stratospheric ozone

• Ozone in smog

• Industrial ozone