The spatial environment control system (100) includes a pathogen sensor (120) that detects a pathogen existing in the space, and a group of environmental sensors that detect an environmental value indicating at least one of the temperature, humidity, chlorine concentration, and ozone concentration of the space. (130), a human sensor (140) that detects a person existing in the space, an adjustment device group (150) that adjusts the environment of the space, and a control unit (164) that controls the adjustment device group (150). When the concentration of the pathogen detected by the pathogen sensor (120) is higher than a predetermined threshold value, the control unit (164) (a) when the presence of a person in the space is detected by the human sensor (140). , The permissible range of the environmental value is set to the first range, and (b) when the presence of a person is not detected in the space by the human sensor (140), the permissible range of the environmental value is set wider than the first range. It is set in the range of 2, and the adjusting device group (150) is controlled so that the environmental value falls within the set first or second range.
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