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International Space Station (ISS) air sampling. NASA astronaut Sunita Williams (born 1965, Expeditions 14 and 15 flight engineer) conducting Surface, Water and Air Biocharacterization (SWAB) air sampling in the Destiny laboratory of the ISS. To monitor microbial levels on the ISS, crew members use grab sample containers, dual absorbent tubes and swabs to collect air, water and surface samples and send them to Earth for detailed analysis and identification every 6 months. Microbe levels are maintained at acceptable levels by periodic scheduled sanitation routines. Photographed during Expedition 15 (7 April 2007 to 21 October 2007).
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