Emissions were increasing rapidly until the s. Since then the world has achieved rapid progress: the near-elimination of ozone-depleting substances and the trend towards recovery of the ozone layer are arguably among the most successful international environmental collaborations to date. In this entry we present the data on ozone layer depletion, signs of recovery, emissions of ozone-depleting substances, international agreement and collaboration, and the consequences of ozone layer depletion. It is formed of three oxygen atoms giving it the chemical formula, O 3.
Reduced ozone levels as a result of ozone depletion ozone depletion A chemical destruction of the stratospheric ozone layer beyond natural reactions. Stratospheric ozone is constantly being created and destroyed through natural cycles. Various ozone-depleting substances ODS , however, accelerate the destruction processes, resulting in lower than normal ozone levels. UVB is a kind of ultraviolet light from the sun and sun lamps that has several harmful effects.
The Earth's ozone layer ozone layer The region of the stratosphere containing the bulk of atmospheric ozone. The ozone layer lies approximately kilometers miles above the Earth's surface, in the stratosphere. Depletion of this layer by ozone depleting substances ODS will lead to higher UVB levels, which in turn will cause increased skin cancers and cataracts and potential damage to some marine organisms, plants, and plastics. Less ozone-layer protection from ultraviolet UV light UV Ultraviolet radiation is a portion of the electromagnetic spectrum with wavelengths shorter than visible light. UVA is not absorbed by ozone.