Does Cleaning Improve Your Mood?

Clean spaces have been shown to promote a more relaxed mind, but why is this?

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A Difference-in-Differences Analysis of Health, Safety, and Greening Vacant Urban Space (Journal of Epidemiology)
"Greening of vacant urban land may affect health and safety. The authors conducted a decade-long difference-in-differences analysis of the impact of a vacant lot greening program in Philadelphia, Pennsylvania, on health and safety outcomes. 'Before' and 'after' outcome differences among treated vacant lots were compared with matched groups of control vacant lots that were eligible but did not receive treatment."

Physical Order Produces Healthy Choices, Generosity, and Conventionality, Whereas Disorder Produces Creativity (Association for Psychological Science)
"Order and disorder are prevalent in both nature and culture, which suggests that each environ confers advantages for different outcomes. Three experiments tested the novel hypotheses that orderly environments lead people toward tradition and convention, whereas disorderly environments encourage breaking with tradition and convention-and that both settings can alter preferences, choice, and behavior."

Disgust leads people to lie and cheat; Cleanliness promotes ethical behavior (ScienceDaily)
"While feelings of disgust can increase behaviors like lying and cheating, cleanliness can help people return to ethical behavior, according to a recent study. The study highlights the powerful impact emotions have on individual decision-making."