Table 1.

List of air and surface samples and description of the corresponding sampling area at the Mars500 facility (EU-250 = utility module, EU-150 = habitable module, and EU-100 = medical module)

Module	Air sample no.	Description	Surface Sample no.	Description	Surface character	Orientation
250	1	On the floor in front of the toilet	2	Wall above the vanity basin	Stainless steel	Vertical
	6	On the floor of the gym next to the treadmill	3	Wall under the faucet close to the corner in the per capita shower cabin	Stainless steel	Vertical
	7	On the floor in front of the greenhouse	9	Left hand side of the inside of the greenhouse	Stainless steel	Vertical
	8	On the floor between storage racks	11	Rack surface from the storage area of clothes	Stainless steel	Horizontal
	9	On the floor between the fridges
150	3	On the carpeted part of the floor in the community room	1	External surface of the toilet bowl	Stainless steel	Horizontal
	4	On top of the table in the dining area	4	Wall in the corner in the community cabin	Wood	Vertical
	5	On the floor of an individual compartment	5	Desktop surface close to the keyboard on the left hand side in the main panel	Wood	Horizontal
			6	Surface of the dining table in the kitchen	Wood	Horizontal
			10	Table surface in individual compartment	Wood	Horizontal
100	2	On the floor at the working place between desk and bunk	7	Table surface close to the insulator zone	Wood	Horizontal
			8	Table surface around water plum	Wood	Horizontal