Ozone Layer

In the ozone layer, ozone concentration is ~10 ppm. Ozone concentrations drop very fast from there. Figure 2ppm or less overall (0.0002%)

This is a serious question. Use a .gov resource to begin a search for such answer and be willing to take the time to learn. Knowledge is power.

http://ga.water.usgs.gov/edu/gwdepletion.html

Freon is actually a brand name for a class of compounds known that contain fluorine, and are gases at room temperature. If the compound also contains the halogens chlorine or bromine, these compounds are known ozone depleters (CFCs, HCFCs, and so on). The fluorine presents no challenge, but the other halogens do. For instance, Freon R-12 is CCl2F2. These compounds were commonly used until it was discovered that they can catalytically destroy ozone. Bromine from Halons has a very similar effect. Here is what happens when these man-made molecules are released into the atmosphere: # They mix in the troposphere # They mix into the stratosphere # When exposed to UV light, the C-Cl bond is broken and the free radical Cl. is formed # Cl. reacts with ozone (O3) to form O2 and ClO, another radical. # ClO reacts with O to form O2 and Cl. # Go back to step 4. and the process repeats itself until the Cl is rained out as HCl. It could repeat ozone destruction 10,000 times plus or minus, depending only on other compounds to tie it back up, and UV not to release it again. The net chemical reaction is this: O3 + O --> 2O2 CFC's remain in the atmosphere for something like 50 years, continually destroying ozone. Since they were banned by the Montreal Protocol, they have largely been replaced by similar molecules, but these new ones are less stable. These new molecules are destroyed before they are able to reach the stratosphere, where the protective layer of ozone is found, and do not destroy ozone. Many developing nations continue to use the old dangerous CFC's however. The R12 Freon (for one example of hundreds) refrigerant was phased out due to being a Ozone (O3) destroying / interactive chemical. It was replaced with R134. Since the phasing out of R12, measurements of the Antarctic Ozone layer show that the Ozone is recovering and is therefore cited as a positive change resulting from environmental policy. Update: record size ozone hole in 2007, and near record in 2008. R12 may be reduced, but other compounds have apparently stepped in.

Not at all. Carbon dioxide is a gas that plants use to sustain life. The ozone layer thins each winter over the poles due to a lack of sunlight reaching that area during the long winter nights. Once the sun returns, the thinning area quickly disappears.

The Earth's atmosphere acts as a protective shield against the sun's harmful radiation by absorbing and scattering much of it. The ozone layer, specifically found in the stratosphere, also absorbs a significant amount of ultraviolet (UV) radiation, particularly the most harmful UV-B and UV-C rays. Additionally, the Earth's magnetic field helps deflect solar wind and cosmic rays that could be harmful to life on Earth.

Ozone molecule in the atmosphere helps absorb harmful ultraviolet.

The molecular formula for Ozone is O3.

If there was no Ozone layer in the atmosphere, its effect on the life on earth will be devastating.

In the 1970s humans released CFCs into the atmosphere. It was used as a gas in aerosol cans, refrigerators and air conditioners. Production of CFCs was phased out after the Montreal Protocol in 1989. Scientists hope the ozone layer will be repaired around 2050.

Breathing in the ozone layer, which is primarily found in the stratosphere, would not make you terribly ill or kill you as it is too high in the atmosphere to be inhaled directly. However, exposure to ground-level ozone, which is a pollutant formed closer to the Earth's surface, can cause respiratory issues and other health problems over time.

The hole itself does not affect us. The size and duration of the hole affects organisms that require DNA to live, and are located in areas that are exposed to UV-B from the Sun because ozone levels above it are too low to protect them. So far, this has included the tip of South America, since we became aware of the ozone hole.

The ozone layer is a layer contained in stratosphere. The significant amounts of UV entering the earth are blocked by this. It is a pool of ozone gases.

It isn't.

Ozone is an allotrope of oxygen.

An allotrope is a variation of a pure element (for example diamond and graphite are allotropes of carbon)

The ozone hole usually only affects Antarctica directly, and it is not considered to be a country. However, it has appeared over areas like New Zealand, Australia, the southern tip of South America (which includes Argentina and Chile) and the Falkland Islands (a British territory) for brief periods of time. There is also an ozone-depleted area in the Arctic, but this only occurs for a few days at a time.

This is the stratosphere. There is also ozone in the lower troposphere, but the ozone layer in the stratosphere contains helpful ozone that blocks much of the ultraviolet radiation. Without this layer, life on earth would be very difficult.

Ozone molecules are always falling apart into O2 and O, but the free O just goes and bumps into another O2 forming more ozone. So it's more instructive to talk about "odd oxygen" (odd number, i.e. O and O3).

Odd oxygen sometimes just bumps into another and becomes regular old O2 again. It can also react with an unrelated chemical and be removed that way. Chlorine is especially good at this because it catches two Os and sticks them together to form an O2. The Cl then is free to do it again to another pair of Os. This action requires UV from sunlight to recycle.

Fortunately there are about 18% natural sources of chlorine in the stratosphere. Unfortunately there is 82% man-made source, chlorofluorocarbons.

The whole process is much more complicated than is described here, with a lot of intermediate chemicals, and contributing pathways. The signature of these intermediate chemicals is the smoking gun that shows that the antarctic ozone hole is made larger than it would normally be by CFCs.

Ozone depletion refers to the thinning of the ozone layer in the Earth's stratosphere due to the release of harmful chemicals like chlorofluorocarbons (CFCs). This thinning can lead to increased levels of ultraviolet (UV) radiation reaching the Earth's surface, which can cause skin cancer, cataracts, and harm to marine life and ecosystems. Efforts such as the Montreal Protocol have been made to reduce the use of ozone-depleting substances and mitigate its effects.

Exposure to ozone can cause premature death, asthma, bronchitis, heart attacks, and any other cardiovascular problems.

For more info on ozone, go here:

http:/en.wikipedia.org/wiki/Ozone

The ozone layer is constantly being renewed by available oxygen, and UV-C from our Sun. UV-C and UV-B from the Sun also destroy ozone, but so do contaminants (and time). So "repairing itself" involves getting rid of contaminants. Some contaminants take decades to eventually leave the vicinity of the ozone layer, and nothing we can do will accelerate that process (and leave the ozone layer intact). So all we can do is wait, and stop adding old (or new) contaminants to the air.

We could stop making chemicals that destroy ozone. We could stop buying products that are made in countries that are not bound by agreements to reduce or eliminate ozone destroying chemicals. About 2/3 of the man-made ozone destruction is related to CFC-11 and CFC-12.

Ozone layer in stratosphere blocks around 97% of the total radiation received by the earth. It acts as a blanket and keeps the atmosphere cool. It is responsible for the survival of life on earth.

O (oxygen), N (nitrogen), H (hydrogen), Cl (chlorine), Br (bromine)

Corona

It was nonexistent before there was significant oxygen in the atmosphere.

After the Great Oxidation Event, we developed our ozone layer, complete with annual ozone "holes" at each pole.

We have evidence of sporadic events punching holes in the ozone layer from time-to-time.

Since the 1700s, the ozone layer has been getting steadily thinner.

This gets us to "current events".

Yes, hydrofluorocarbons (HFCs) do not harm the stratospheric ozone layer. However, HFCs are potent greenhouse gases, contributing to global warming. Efforts are being made to shift towards more environmentally friendly alternatives, such as hydrofluoroolefins (HFOs) and natural refrigerants like carbon dioxide (R-744) and ammonia (R-717).

Ozone is O3. Like oxygen but three atoms together. It is a gas and is important in filtering light rays.

The ozone layer has the usual atmospheric constituents, 78% nitrogen, nearly 21% oxygen, (argon and more), almost no water vapor, and 9 ppm of ozone at peak value. And yes, they are gases at even the very cold temperatures to be found there.

the source of cfc is mainly from refrigerators n ac's...increase in the emission of cfc may lead to a hole in the ozone layer,the result of which is harmful rays such as ultra violet rays reaching out to people which causes skin cancer