Question

what is ozone hole? what r it's characteristics

Answer 1

ozone hole is depletion of ozone layer.generally seen more in regions of Antarctica

ozone hole is formed due to global warming and excessive production of CFC(chlorofluorocarbons )
in the atmosphere causing pollution leading to formation of ozone hole...

Answer 2

Chlorofluorocarbons (CFCs) and other halogenated ozone depleting substances (ODS) are mainly responsible for man-made chemical ozone depletion. The total amount of effective halogens (chlorine and bromine) in the stratosphere can be calculated and are known as the equivalent effective stratospheric chlorine (EESC).
The ozone hole is not technically a “hole” where no ozone is present, but is actually a region of exceptionally depleted ozone in the stratosphere over the Antarctic that happens at the beginning of Southern Hemisphere spring (August–October). Satellite instruments provide us with daily images of ozone over the Antarctic region. The ozone hole image below shows the very low values (blue and purple colored area) centered over Antarctica on October 4, 2004

characteristics

Ozone absorbs radiation strongly in the ultraviolet region of the atmospheric spectrum between 220-290 nm. This protects the Earth and its inhabitants from the harmful ultraviolet radiation of the Sun. Without this protective layer, more ultraviolet radiation would reach the surface of the Earth and cause damage to plant, animal and human life.Pure ozone is a blue gas, with a strong irritating smell. When inhaled, it causes headache and nausea. In smaller proportions it smells pleasant.It is about 1.5 times heavier than air and has a vapor density of 24, corresponding to the formula O3.It is more soluble than oxygen in water, about 49% by volume at 0°C.It gets liquefied to a deep blue colour liquid, when cooled in liquid air.It boils at 161.2 K and solidifies to violet-black crystals, which melt at 80.6 K.It dissolves readily in turpentine oil and acetic acid.