Nine out of ten people are estimated to breathe air containing high levels of pollutants, causing around 7 million deaths every year. More than 90% of these deaths occur in the developing world. Many of these areas have no surface air-quality monitoring networks and rely mainly on modelling and satellite information. Besides air pollution, there are other aspects of atmospheric composition that can affect health, eg UV radiation, which strongly depends on the stratospheric ozone layer.
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