Table 5.
Results of centrality analysis

Closeness centrality			Harmony centrality			Betweenness centrality			Degree centrality
Problem	Site	Solution	Problem	Site	Solution	Problem	Site	Solution	Problem	Site	Solution
Particular matter	City	Analysis	Particular matter	City	Analysis	Particular matter	City	Analysis	Particular matter	City	Analysis
Environment	Park	Plan	Environment	Park	Plan	Environment	Park	Plan	Environment	Park	Plan
Atmosphere	Area	Management	Development	Green area	Management	Dust	Green area	Management	Development	Green area	Management
Concentration	Green area	Creation	Atmosphere	Area	Utilization	Concentration	Area	Green new deal	Concentration	Area	Utilization
Land	Space	Utilization	Concentration	Ecology	Evaluation	Development	Ecology	Vacant land	Atmosphere	Ecology	Facility

Only Top 5.