Why there is hole in ozone?

Answer 1

The hole is caused by a lack of sunlight reaching the oxygen in the stratosphere. It is also caused by chlorofluorocarbons (CFCs). Ozone is an unstable gas that decays into oxygen when there is no energy to keep it bound.

The ozone hole occurs in later winter / early spring, when visible light hits the atmosphere of the hole, but UV-C has been filtered out by atmosphere elsewhere. So contaminants like CFCs that need visible light to photocatalytically destroy ozone get what they need, but new ozone is not made.

Answer 2

CFC's released from aerosol cans, for example, react with Stratospheric ozone and cause it to get thinner. It has little to do with pollution and recycling. The hole in the ozone layer is primarily centered near the south pole where a variety of factors (temperature and sunlight, for example) cause it to be amplified.

Answer 3

There is a hole in ozone in Antarctica. It is because of the low temperature there.

The layer of ozone in the stratosphere has become thinner over Antarctica, more so than in other regions, but there is not an actual "hole" where all ozone is missing. The thickness of the layer varies through seasons and over time. Over Antarctica, as much as 65% of the ozone layer has been destroyed from normal levels. The cold temperatures of Antarctica winters allows the formation of Polar Stratospheric Clouds (PSC's) which provide conditions to destroy ozone in the presence of certain man-made chemicals such as Chlorofluorocarbons (CFC's). Because the lifespan of CFC's is so long, around 50 - 100 years, they can survive long enough to be carried to the Antarctica by winds from the industrialized countries that emit the CFC's, mainly as aerosols and refrigerants (Freon). Usually there is no cloud formation in the stratosphere due to its low moisture content, but in winters in Antarctica, where the sun does not shine for 3 months, temperatures drop to -80 degrees Celcius which provides the ultra-cold conditions in which PSC's form. Chemical reactions can take place on surfaces of PSC's with the Chlorine atoms (Cl) that bond with the Oxygen atoms (O), converting ozone molecules (O3) to oxygen molecules (O2), and repeating the process over and over again. Chlorine Monoxide (ClO) again bonds with oxygen atoms that would otherwise form with oxygen molecules back into ozone, to return to the destructive Chlorine atom (Cl). In this chemical cycle, one Chlorine atom can destroy 15,000 ozone molecules. Other elements such as the halogen Bromine (Br), Nitrogen Oxide (NO) from supersonic jets, and the Hydroxyl radical (OH) formed from methane (CH4), have the same effect on ozone. Bans on aerosols can help to stop this trend and restore the ozone to its original state, but it will take decades before the chemicals are removed from the atmosphere. There is already a higher Death Rate from skin cancer in Australia, which is not far from the ozone hole, and planktons in the ocean have diminished which provide an essential food source for ocean mammals such as whales and the krill which are an essential food source as well. - pianodriver

Answer 4

There is hole in ozone layer because CFC gases which are pollutants are responsible for the depletion of ozone layer. CFC convert ozone to oxygen and make it useless for the absorption of UV radiation.

Answer 5

They say it because of low concentration of ozone. It is termed as ozone hole.

Answer 6

There is a hole in the ozone layer. It is due to man made activities. they release ODS which cause ozone destruction.

Answer 7

The ozone layer is getting thinner. This thinning is termed as ozone hole.