sentences:  Once the data has been collected, they then analyze the data to determine, among other things, the risks to human health due to exposure to the various chemicals within the spacecraft as well as other toxins during their flight.From that, the hygienists can determine the appropriate measures to take to mitigate exposure of the astronauts to the harmful chemicals.Once on the surface of a moon or planet, the astronautical hygienist would also collect data on the nature of the dust, and the levels of radiation on the surface.