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To achieve the Chinese government's CO 2 emissions reduction target and build a carbon trading market in the Pearl River Delta (PRD) region, an initial allocation of CO 2 emissions quotas among cities in this region is fundamental. Different from the previous CO 2 emissions quotas allocation methods, this paper uses the maximum deviation method (MDM) to allocate CO 2 emissions quotas in the PRD region by taking the imbalanced development of different cities into consideration. Three principles including equality (represented by a population indicator), efficiency (represented by a GDP indicator) and feasibility (represented by a historical CO 2 emissions indicator) are considered in the method. The results reveal that the allocations derived by the MDM are more balanced than those derived using either single indicator approach or the information entropy method, and more closer to the development targets of Guangdong province. The more balanced allocations will be conducive to stimulating the development of under-developed cities and narrowing the gap between developed and under-developed cities, thus help to achieve the sustainable development in the PRD region. This paper helps to enrich the emissions quotas allocation methods and provides a new equitable method for policy makers to allocate emissions quotas under imbalanced development circumstances. [ABSTRACT FROM AUTHOR]