Table 4.

Spillover effect of spatial relationship block of haze pollution.

Block	The number of cities	Receive relationship		Send relationship		Expected internal relationship ratio	Actual internal relationship ratio	Block type
		Inside the block	Outside the block	Inside the block	Outside the block
I	3	5	39	5	36	13%	12%	Bilateral overflow
II	4	11	47	11	31	20%	26%	Net beneficiary
III	6	28	42	28	58	33%	33%	Net overflow
IV	3	4	34	4	37	13%	10%	Broker

Notes: Expected internal relationship ratio = (number of cities within the block-1) / (number of cities in the network-1); Actual internal relationship ratio = number of internal relationships of blocks / total number of spillover relationships of blocks.