Explain “ Ozone layer “ and “Ozone Hole ”. 4 marks 2003

The ozone layer or ozone shield refers to a region of Earth’s stratosphere that absorbs most of the Sun’s ultravioletozone (UV) radiation. It contains high concentrations of ozone (O3) relative to other parts of the atmosphere, although still very small relative to other gases in the stratosphere.

The ozone “hole” is really a reduction in concentrations of ozone high above the earth in the stratosphere. The ozone hole is defined geographically as the area wherein the total ozone amount is less than 220 Dobson Units. The ozone hole has steadily grown in size (up to 27 million sq. km.) and length of existence (from August through early December) over the past two decades.After a series of rigorous meetings and negotiations, the Montreal Protocol on Substances that Deplete the Ozone Layer was finally agreed upon on 16 september 1987 at the Headquarters of the International Civil Aviation Organization in Montreal.ozone hole

The Montreal Protocol stipulates that the production and consumption of compounds that deplete ozone in the stratosphere–chlorofluorocarbons (CFCs),  halons, carbon tetrachloride, and methyl chloroform–are to be phased out by 2000 (2005 for methyl chloroform). Scientific theory and evidence suggest that, once emitted to the atmosphere, these compounds could significantly deplete the stratospheric ozone layer that shields the planet from damaging UV-B radiation.

Man-made chlorines, primarily chloroflourobcarbons (CFCs), contribute to the thinning of the ozone layer and allow larger quantities of harmful ultraviolet rays to reach the earth.

Final Destination for Haryana PSC Notes and Tests, Exclusive coverage of HPSC Prelims and Mains Syllabus, Dedicated Staff and guidence for HPSC Exams HPSC Notes brings Prelims and Mains programs for HPSC Prelims and HPSC Mains Exam preparation. Various Programs initiated by HPSC Notes are as follows:- For any doubt, Just leave us a Chat or Fill us a querry––

Hope we have satisfied your need for HPSC Prelims and Mains Preparation

Kindly review us to serve even better


HPSC Mains Test Series 2020

20 Quality mock tests and GS Mains Notes

Mains Test Series and Notes

Mains Printed Notes (With COD)


HPSC Prelims Test Series 2020

24 Quality mock tests and GS Prelims Notes

Prelims Test Series and Notes

Prelims Printed Notes (With COD)

[jetpack_subscription_form title=”Subscribe to HPSC Notes” subscribe_text=”Never Miss any HPSC important update!” subscribe_button=”Sign Me Up” show_subscribers_total=”1″]

error: Content is protected !!