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In the united states, many regulations are aimed at decreasing the amount of ground-level ozone in the air, because ground-level ozone is considered a pollutant. At the same time, many regulations are aimed at increasing the amount of ozone in the ozone layer. Despite the fact that ozone in the ozone layer is the same as ground-level ozone, ozone in the ozone layer is not considered a pollutant. Instead, it is considered an essential substance. why?
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