Offices may have different indoor environmental quality related problems, such as space, indoor air quality, office workers’ thermal comfort, productivity, and mental stress. The objective of this study was to examine the effect of indoor plants on physiological/psychological responses and productivity, and to examine the mental healthcare status of office workers. To clarify the effect of indoor plants, we conducted a demonstration experiment in two rooms of an office. The experiment was performed in two office spaces (Office A and Office B) located in Kyoto, Japan. Office A was a call center and Office B was a general office. Subjects were office workers working in one of the above two office spaces. In the experiment, nine cycles were conducted while changing the type of plants including vegetables and foliage plants. A preliminary experiment without plants was conducted as a reference case. Results indicated that plant installations in office spaces have certain mental health‐care effects, namely, relaxation of visual fatigue and the feelings of drowsiness of five groups of work‐related fatigue feelings, and the effects by installations of plants depend on the type of plant and industry, although this study had some limitations because of the demonstration experiment.

Some offices have indoor environmental quality related problems such as space, indoor air quality, office workers' thermal comfort, productivity and mental stress. The objective of this study is to examine the effect of indoor plants on physiological/psychological responses and productivity, and to demonstrate the mental healthcare for office workers. In order to clarify the effect of indoor plants, we conducted a demonstration experiment in two rooms of an office. As a result, it was possible to confirm that plants installation in office space has some mental healthcare effects, i.e., relaxation of visual fatigue and some kinds of fatigue feelings.