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Ozone is a greenhouse gas, and ozone depletion in the upper atmosphere is believed to have had a slight cooling effect, especially over Antarctica where the “ozone hole” exists in the upper atmosphere. Thus, ozone depletion in the upper atmosphere has not contributed significantly to global warming, although ozone depletion remains a concern because of its ability to block harmful ultraviolet radiation from reaching humans and wildlife. The ozone hole does not contribute to global warming by letter more of the sun’s rays reach the Earth.
Ozone in the lower atmosphere is an air pollutant that contributes to health problems. Ozone in the lower atmosphere has increased over the past century because of increasing automobile and industrial pollution, thus contributing to global warming.
Source: Center for Climate and Energy Solutions