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Many miniature SGS units with high sensitivity may be distributed in the spacecraft to give very fast detection of any rapid local change in the cabin air quality (‘gas event’).

Thus, a crewed cabin air monitor is designed allowing the detection and monitoring of trace gas dynamics of a spacecraft atmosphere providing besides the continuous air monitoring activities, warning capability in case of malfunctions.

The system represents a versatile air quality monitor, allowing for the first time the detection and monitoring of trace gas dynamics, with high time resolution, in a spacecraft atmosphere. ANITA operated on the ISS from September 2007 to August 2008. This paper summarises the results of ANITA's air analyses and compares results to other measurements acquired on ISS during the operational period.

This crewed cabin air quality monitor allows the detection and monitoring of trace gas dynamics of a spacecraft atmosphere, providing continuous air monitoring as well as crew warning capability in case of malfunctions.

This air quality monitor allows therefore the detection and monitoring of trace gas dynamics of the spacecraft atmosphere, providing continuous air monitoring as well as crew warning capability in case of malfunctions.

After 11 months of successful operation onboard the ISS US laboratory Destiny, the air quality monitors ANITA (Analyzing Interferometer for Ambient Air) was brought back to Earth on STS126 (ULF2). ANITA is a technology demonstrator flight experiment for continuous air quality monitoring inside the crewed cabin of the ISS with low detection limits and high time resolution. For the first time, the dynamics of the detected trace gas concentrations could be directly resolved by ANITA and correlated to gas events in the cabin. The system is the result of a long term ESA technology development programme initiated more than seventeen years ago. The ANITA mission was a cooperative project between ESA and NASA. ESA's responsibilities were the provision of the H/W, the data acquisition and the data evaluation. NASA was responsible for the launch, accommodation and operation onboard ISS, data download and the transportation of ANITA back to the Earth.