Ozone Day

World Ozone Day is observed on September 16 annually to spread awareness globally about the depletion of Ozone Layer and to find possible scientific solutions to preserve the protective layer, Ozone. United Nations announces a theme every year, also publishes the results of Scientific Assessment of Ozone Depletion. On this day, various environmental organizations all over the world hold seminars and discussions on the ozone layer depletion.

Ozone Day 2023

Sat , 16th Sep 2023

Schools and other educational establishments teach students about the benefits of the protective Ozone layer and conduct special events & activities to spread awareness to prevent or minimize the depletion.

History of Ozone day and the plan

The scientific evidence of the depletion of the ozone layer prompted the international scientific community to create a mechanism for cooperation to take preventive action to protect the ozone layer. This idea was formalized in the Vienna Convention for the Protection of the Ozone Layer, on 22 March 1985. This idea was adopted and signed by 28 countries. Around 1987, in the month of September this led to the drafting of a treaty called-The Montreal Protocol on Substances that Deplete the Ozone Layer.

United Nations signed an international treaty called “The Montreal Protocol” on September 16 in 1987 aimed at protecting the ozone layer of the earth’s atmosphere. They planned to reduce the production or emission of substances that result in ozone layer depletion. The Montreal Protocol projects a plan to phase down the consumption and production of ozone depleting substances (ODS) in a planned step-wise manner, with scheduled timetables for both developed and developing countries. This treaty has listed out specific responsibilities regarding the process of phasing out different types of ODS, control of ODS related trades, fetching annual reporting of ODS data, national licensing systems to control ODS imports and exports. All parties like business entities, Governmental organizations have the above listed responsibilities.

According to the latest Scientific Assessment of Ozone Depletion done in the year 2018, parts of the ozone layer have recovered at a constant rate of 1-3% per decade since the year 2000. At these projected rates of recovery, Northern Hemisphere and mid-latitude zonal ozone will heal completely by 2030s. The Southern Hemisphere show complete healing around the year 2050s and cold Polar Regions will follow by 2060.

Ozone Layer

Ozone layer is a fragile shield of gas around the Earth that filters and protects the planet from the harmful UV portion of the Sun rays thus preserving life on the Earth planet. Ozone layer has molecules called Ozone- O3, chemically it is made up of three atoms of oxygen, a highly reactive gas and heavier than O2- regular Oxygen molecule. The Ozone layer is present in the atmosphere, approximately 15-35km from the Earth ground level. Especially the lower portion of the stratosphere layer has relatively high concentrations of Ozone (O3). When pollutants like Carbon Monoxide, halocarbon refrigerants, solvents, propellants, and other foam blowing agents like chlorofluorocarbons are released into the air, they react with O3 and deplete the zone causing a hole. This hole can cause penetration of harmful UV into the atmosphere.

Today, Ozone layer protection efforts along with the fight against climate change has averted an estimated 135 billion tons of carbon dioxide equivalent emissions, between the years-1990 to 2010.

Ozone Day festival dates between 2019 & 2029




Monday, 16th of September


Wednesday, 16th of September


Thursday, 16th of September


Friday, 16th of September


Saturday, 16th of September


Monday, 16th of September


Tuesday, 16th of September


Wednesday, 16th of September


Thursday, 16th of September


Saturday, 16th of September


Sunday, 16th of September

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