From the Guest Editors: Happy and Healthy Cities

[...]many multidisciplinary studies focus on urban liveability, well-being, safety, health, and happiness. [...]many studies also address the negative externalities of cities, as modern cities are under stress, seen from the perspective of poverty, quality of life, environmental conditions, crime, or congestion. In addition to happy cities, the popularity of healthy cities also increases as a research topic;such cities offer sound environmental conditions (e.g., liveability, air and water quality, green spaces, safe neighbourhoods, climate neutral production and consumption, virus-resistant cities) and favour individual and group well-being (mentally and physically). [...]the variables for different tolerance types were producing mixed results, as did the inclusion or exclusion of or restriction to largest cities, changing the results from supporting to contradicting the Creative Class Theory.