Analysis and Prediction of the Coupling Coordination Relationship between Tourism and Air Environment: Yangtze River Economic Zone in China as Example

Table 3

Evaluation classification for CCD.

Range	Value of D	Category
Coordinated (can be accepted)	1 ≥ D ≥ 0.8	Highly coordinated
	0.8 ≥ D ≥ 0.7	Intermediately coordinated
	0.7 ≥ D ≥ 0.6	Primarily coordinated
Transitional coordinated	0.6 ≥ D ≥ 0.5	Reluctantly coordinated
	0.5 ≥ D ≥ 0.4	Approaching imbalanced
Imbalanced (cannot be accepted)	0.4 ≥ D ≥ 0.3	Slightly imbalanced
	0.3 ≥ D ≥ 0.2	Moderately imbalanced
	0.2 ≥ D ≥ 0	Highly imbalanced