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NASA's Aura satellite is celebrating its 10th anniversary. It has provided vital data about the cause, concentrations and impact of major air pollutants. Aura has improved our understanding of ozone, a versatile gas that both benefits and harms the atmosphere, depending on its location. Near the ground, ozone is a pollutant that damages plants and can decrease lung function in humans. Somewhat higher in the atmosphere, ozone affects climate as a greenhouse gas. [Source: NASA Jet Propulsion Laboratory]
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