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ON

OZONE DEPLETION

SUBMITTED TO:- SUBMITTED BY:-

MRS SUNITA & MRS RAJLATA RATIKA

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Mr. OZONE:

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is a highly-reactive from of oxygen. Unlike oxygen (O2), ozone has a strong scent

and is blue in color.

exists within both the tropospheric andstratospheric zones of the Earths atmosphere

, ground level ozone is a majorair pollutant and primary constituent ofphotochemical smog

ozone layer is anessential protector of life on earth as it absorbsharmful UV radiation before it reaches the earth.

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1.

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Damage to plant cell DNA molecules - makes

plants more susceptible to pathogens and

pests

Reductions in photosynthetic capacity in the

plant - results in slower growth andsmaller leaves

Causes mutations in mammalian cellsand destroys membranes

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Skin cancer

Premature aging (photoaging) of the

skin (different from normalchronological aging)

Cataracts and eye disorders (corneal

sunburn and blindness) Immune system damage

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Clouds cover - partly cloudy days dolittle to reduce UV exposure but rainy orsubstantially overcast days reduce UV

exposures

The time of day peak exposure time

is 12:00 noon - 1:00 p.m. UV intensityis reduced by about half at three hoursbefore and three hours after the peakexposure time.

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The time of year- more UV isreceived in the late spring and earlysummer and much less is received in

the late fall and early winter.

Life styledetermines a personsrisk to UV exposure. Skiing,

sunbathing, or swimming can lead toextremely high exposures. Use oftanning parlors also increase risk.

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Mario Molina and Sherwood Rowlandshowed in 1974 that CFC gases destroy ozone

Coordinating committee on Ozone Layer(CCOL) established by UNEP in the 1970s

Vienna Convention for the protection of theozone layer held in 1985

Montreal Protocolto ban substances that

deplete the ozone layer held in 1987 Amendments to the Montreal Protocol:

London - 1990, Copenhagen - 1992 andMontreal - 1997.

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THANKS