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How Have Humans Affected the Ozone Layer?

Since the mid-1970s scientists have been concerned about the harmful effects of certain chlorofluorocarbons (CFCs) on

A Little Bit About Atmospheric Layers

The troposphere is the layer of the atmosphere closest to the earth.

What Is The Ozone Layer?

The ozone layer is a layer in the Earth's atmosphere containing high concentrations of ozone.

3D Ozone Map

This 3D map shows a 20 km x 20 km area of land and the air above it extending to an altitude of 100 km.

The Ozone Map

Drag the map to explore the atmosphere! Turn elements of the map on and off using the buttons at the bottom.

Montreal Protocol Parties Discuss HFC Management Issues and Agree to Continue Exploring Ways Forward

Bangkok, 24 April 2015 – Parties to the Montreal Protocol on Substances that Deplete the Ozone Layer


Kigali Amendment Kigali Amendment
Montreal protocol progress
Kigali Amendment

The Kigali Amendment to the Montreal Protocol entered into force on 1 January 2019 after the threshold for the agreement to enter into force was met on 17 November 2017, when it was ratified by 20 parties.

Working towards climate neutrality Working towards climate neutrality
Greening the blue
Working towards climate neutrality

The Ozone Secretariat is part of the UN’s “Greening the Blue” efforts to move towards climate neutrality. The Secretariat works towards climate neutrality by measuring the carbon footprint of Vienna Convention and Montreal Protocol meetings ...

World Ozone Day

Montreal Protocol - Global cooperation protecting life on earth

Montreal Protocol - Keeping us, our food and vaccines cool

Ozone for life: 35 years of ozone layer protection

32 years and healing

Keep cool and carry on

30th anniversary of the Montreal Protocol: we are all ozone heroes

Ozone and climate: restored by a world united

Precious ozone: 30th anniversary of the Vienna Convention and international ozone day 2015

Earlier celebrations of international ozone day