Which among the following factors contributing for the depletion of stratospheric ozone layer o...........

Geography Atmosphere

Which among the following factors contributing for the depletion of stratospheric ozone layer over the Arctic region?

Select the correct code.

1,2&4 only

2,3&4 only

1,2&3 only

All of the above

Recently, Scientists have noticed a strong reduction of ozone concentrations over the Arctic. This ‘mini hole’ in the ozone layer is believed to have been caused by unusual atmospheric conditions, including freezing temperatures in the stratosphere.
As per the ESA, cold temperatures (below -80°C), sunlight, wind fields and substances such as chlorofluorocarbons (CFCs) are responsible for the ozone layer.
Although Arctic temperatures do not usually fall as low as in Antarctica (this year) powerful winds flowing around the North Pole trapped cold air within what is known as the polar vortex— a circling whirlpool of stratospheric winds.

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