The coastal pollution has been evaluated using indexes like Clean Coast Index (CCI) in many countries. In this study, several coasts and urban areas in northern of Iran along the Caspian Sea, were assessed in terms of number and composition of litters. Furthermore, Clean Environment Index (CEI) was used for the first time to interpret the results. The results indicated that 60% of the coasts and 50% of the urban areas were in a dirty status and only 22% of the total surveyed areas were found to be in a clean status. The highest number of litters observed in the study areas was cigarette butt. Due to the impact of risk factor of different types of littered waste, it was obviously clear that CEI offers a more realistic and rigorous interpretation than CCI. Therefore, this new index can be considered to evaluate litters pollution in various areas.

许多国家已经使用清洁海岸指数（CCI）等指标评估沿海污染。在这项研究中，对伊朗北部里海沿岸的几个海岸和城市地区的垃圾数量和组成进行了评估。此外，首次使用清洁环境指数（CEI）来解释结果。结果表明，60%的海岸和50%的城市地区处于肮脏状态，只有22%的调查区域处于清洁状态。在研究区域观察到的垃圾数量最多的是烟蒂。由于不同类型垃圾的风险因素的影响，很明显，CEI 提供了比 CCI 更现实和更严格的解释。因此，可以考虑用这个新指标来评价各个地区的凋落物污染。