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The production “congestion” phenomenon is widespread in reality although few   models nowadays consider its influences. In this study, production congestion   is introduced into an environmental efficiency evaluation model and a new   data envelopment analysis model that considers both production congestion and   undesirable output is established so as to measure environmental efficiency   evaluation effectively. On this basis, we divide technological change into   productive technological change and energy-savings emission reduction   technological change to establish their influences on the congestion   phenomenon. The results show that productive technological change cannot   relieve the degree of congestion while green technology change that   stimulates environmental efficiency improvement can greatly alleviate   situations of congestion

Environmental efficiency evaluation of china based on a kind of congestion and undesirable output coefficient