World Ozone Day

On September 16th we will be celebrating the 30th anniversary of the Montreal Protocol, a document which was signed by 24 countries in 1987.

The document was an agreement that all the countries involved would try to limit their use of substances containing chlorofluorocarbons (CFCs), which contribute to the depletion of the ozone layer. At the time, CFCs could be found in everything from aerosol sprays to computers to aeroplane engines.

The ozone layer is a shield of gas which protects the Earth from the sun’s most harmful radiation. But CFC pollution was causing it to thin, putting the planet at risk.

The Montreal Protocol worked. Last year, scientists observed that the hole in the ozone layer above the Antarctic is now slowly repairing itself. If Earth stays on track, the hole may even close by 2050.

World Ozone Day was created by the United Nations General Assembly in order to raise awareness for protecting the ozone layer — and its success is a reminder that when people and countries work together, they can reduce pollution and help to save the planet.

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Here is an excellent assembly pack that will help to raise understanding and awareness of ozone depletion.


  1. Write a paragraph about the lessons that can be learned from the UN’s effort to stop the depletion of the ozone layer.
  2. Draw a diagram which shows how the ozone layer works.
  3. Make a short video which raises awareness of the depletion of the ozone layer and encourages people to take part in World Ozone Day.