Dec 10, 2024 · Ozone depletion, gradual thinning of Earth’s ozone layer caused by the release of chemical compounds containing gaseous chlorine or bromine from industry and other human activities. The thinning is most pronounced in the polar regions, especially over Antarctica.

Ozone can be destroyed by a number of free radical catalysts; the most important are the hydroxyl radical (OH·), nitric oxide radical (NO·), chlorine radical (Cl·) and bromine radical (Br·). The dot is a notation to indicate that each species has …

Ozone layer depletion is the thinning of the ozone layer present in the upper atmosphere. This happens when the chlorine and bromine atoms in the atmosphere come in contact with ozone and destroy the ozone molecules.

Dec 20, 2024 · Learn about the consequences of ozone depletion and UV-B for human health and the environment. Ozone-Depleting Substances. See a list of chemicals categorized as ozone-depleting substances (ODS) under the Montreal Protocol. Current State of the Ozone Layer. Learn about the recovery of the ozone layer.

Jul 16, 2024 · Ozone layer depletion increases the amount of UVB that reaches the Earth’s surface. Laboratory and epidemiological studies demonstrate that UVB causes non-melanoma skin cancer and plays a major role in malignant melanoma development.

Jan 6, 2025 · Learn about how international action under the Montreal Protocol has helped to reverse ozone layer depletion. The ozone layer hole over the Antarctic is expected to disappear by mid-century.

Jan 10, 2023 · Climate 101: Ozone Depletion The ozone layer helps to protect life from harmful ultraviolet radiation. Find out what caused the ozone hole, and how the 1989 Montreal Protocol sought to put an end...

Depletion of the ozone layer results in increased UV radiation reaching the Earth’s surface, which in turn leads to a greater chance of overexposure to UV radiation and the related health effects of skin cancer, cataracts, and immune suppression.

Jan 29, 2025 · The Montreal Protocol Ozone Secretariat based in Nairobi, Kenya, housed within the United Nations Environment Programme (UNEP) is the administrative office for two important ozone protection treaties/agreements: the Vienna Convention for the Protection of the Ozone Layer and the Montreal Protocol on Substances that Deplete the Ozone Layer. Both play a …

Sep 27, 2024 · Ozone depletion is the steady lowering of the Earth’s ozone layer in the high atmosphere as a result of human activity and the discharge of chemicals including gaseous chlorine or bromine. The thinning is mainly noticeable over Antarctica and in the polar-regions.