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NASA’s DC-8 is on its second tour to survey the world’s atmosphere.

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Scientists on the ATom mission are looking for changes in atmospheric gases

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that occur due to the seasons.

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First stop: Alaska.

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Last summer, evidence of Siberian fires was in the air.

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This winter, pollution from Asia dominated.

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Out the window, the team observed our changing planet.

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The sea ice appeared much thinner than is usual for this time of year.