0866 241 4161

World Ozone Day

International Ozone Day is observed on September 16 every year. Also known as World Ozone Day, this event is meant to remind people about the signing of Montreal Protocol on reducing substances that deplete the ozone layer. The ozone layer or ozone shield is a region of Earth's stratosphere which absorbs most of the Sun's harmful ultraviolet radiation. The stratosphere contains ozone in high concentration, as compared to other layers of the atmosphere.

Montreal Protocol was signed on September 16, 1987. The day for International Ozone Day was chosen by United Nations General Assembly in its 49/114 resolution.

What is ozone layer and what causes depletion of ozone layer?

Ozone layer was discovered by Professor Gordon Dobson of Oxford University in 1957. As mentioned above, Ozone layer offers protection from U V rays of the sun. Ozone or O3 is present around 15 to 35 km above earth. It is the lower portion of stratosphere and has relatively high concentration of ozone. The layer is naturally formed through interaction of solar ultraviolet radiation with molecular oxygen O2. Ozone layer performs the function of reducing UV radiation reaching Earth's surface. At the surface level, ozone is considered as an air pollutant which can cause photochemical smog and acid rain.

Ozone layer can be depleted because of human activity and chemicals like chlorine and bromine. Known as ozone-depleting substances (ODS) these chemicals can break down hundreds of thousands of ozone molecules. Chloro-fluoro-carbons (CFCs), carbon tetrachloride, hydro-chloro-fluoro-carbons (HCFCs) and methyl chloroform are other ODS that can survive for as long as 100 years.

BASIC OBJECTIVES of APCOST in this Activity:

World Ozone Day activity organizes across India at different Schools, Colleges, Universities, Educational Institutions etc., to create awareness about depletion of Ozone Layer in atmosphere. Thinning of this layer therefore poses a threat. In humans, it increases the risk of conditions such as skin cancer, suppression of the immune system and eye cataracts. They also take various steps in educating the students on ozone day spread the knowledge to the students and learners throughout the world.

APCOST with the support of National Council for Science Technology and Communication (NCSTC), DST, Govt. of India has conducted WORLD OZONE DAY PROGRAMS at 56 venues, covering all 11 districts of Andhra Pradesh. District Coordinators (DCs) & District Academic Coordinator (DACs) have associated in organizing the activities. Total 17569 participants (teachers/ guests) have taken part in the program from 56Schools / Institutions. The list is given under for kind information.

Details of World Ozone Day Programs -2019-20

Sl. No.
District Name
No. of Schools / Venues
No. of Students
No. of VIPs / Guests
1 Ananthapuramu 05 1150 50 1200
2 Chittoor 05 850 150 1000
3 East Godavari 05 1091 62 1153
4 Guntur 05 2039 114 2153
5 Krishna 05 1154 80 1234
6 Kurnool 05 1050 70 1120
7 Prakasam 05 2720 146 2866
8 SPSR Nellore 05 2636 105 2741
9 Srikakulam 05 1080 56 1136
10 Visakhapatnam Not Conducted
11 Vizianagaram 05 1837 99 1936
12 West Godawari Not Conducted
13 YSR Kadapa 05 1682 78 1760
Total 55 17289 1010 18299