The article above describes a correlation with being happy and feeling safe with the cleanliness of their city among many other factors. Here is a small excerpt:
"The more respondents felt their city was beautiful (aesthetics), felt it was clean (aesthetics and safety), and felt safe walking at night (safety), the more likely they were to report being happy. Similarly, the more they felt that publicly provided water was safe, and their city was a good place to rear and care for children, the more likely they were to be happy."
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