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Spacecraft nadir point: 32.5° N, 1.6° W

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Spacecraft Altitude: 153 nautical miles (283km)
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Image Caption: STS040-152-139 & STS040-151-243: African Dust
This African dust series is a good example of the vast amount of dust transported over the northern tropical Atlantic. Nadir-viewing Space Shuttle photography identifies the source points of dust over Algeria, Mali, and Mauritania, while oblique Space Shuttle photos and environmental satellite imagery show the horizontal coverage of the dust, stretching from the western Sahara Desert to the western Caribbean Sea. During STS-40, surface stations in Mali observed a horizontal visibility in dust of less than 1,000 meters (surface winds from the northeast with velocities of 16 knots).