Understanding World Ozone Day

The question asks us to identify the specific day designated by the U.N. General Assembly as World Ozone Day. This day is celebrated globally to raise awareness about the importance of the ozone layer and the need to protect it from harmful substances.

Several days are internationally recognized for environmental awareness, such as World Environment Day (5th June). However, World Ozone Day has a specific date related to a significant international agreement.

Identifying the Correct Date for World Ozone Day

The United Nations General Assembly proclaimed September 16 as the International Day for the Preservation of the Ozone Layer. This date commemorates the day, in 1987, when the Montreal Protocol on Substances that Deplete the Ozone Layer was signed.

Let's look at the options provided:

• 1^st June: Not World Ozone Day.
• 5^th June: This is World Environment Day.
• 1^st September: Not World Ozone Day.
• 16^th September: This is the date commemorating the signing of the Montreal Protocol and is designated as World Ozone Day.

Therefore, the day designated as World Ozone Day by the U.N. General Assembly is the 16^th of September.