why ozone hole is seen in antarctica but not in metropolitan cities?

Answer 1

In the stratosphere above metro's, the air is constantly moving and so ozone is dispersed around the world in these currents. Although it may be deteriotated into oxygen, thermodynamic laws show that it will gravitate toward equal dispersion around the globe.

The hole appears above antarctica especially for two reasons. One, the air there is isolated preventing ozone from dispersing rapidly. Two is the formation of ice crystals. In the winter months, ice crystals form in the stratosphere and readily absorb the chlorine and ozone molecules. When the warmth of the spring reaches the stratosphere, these ice crystals melt and the chlorine ions rapidly deteriorate O3 into oxygen (O2). This is why the hole is largest over antarctica towards the end of the summer months.

Answer 2

Because the key chemical reactions that destroy the ozone, can only take place in polar conditions.

They require a polar vortex that isolates the air within it, and very cold temperatures that lead to the formation of Polar Stratospheric Clouds.

CFCs are broken down by sunlight into chlorine and bromine compounds. These react in the Polar Stratospheric Clouds and destroy the ozone.

Answer 3

It has to do with how the Earth spins, and the different wind/sea currents. Antartica has a strong spring wind that circulates around the continent, which creates some sort of a vortex.

Answer 4

can u see star in new york? no