<![CDATA[This study aims to improve the learning outcomes of Class V students of SDN 067259 Medan Johor district on pollution and its impact through the application of Problem Based Learning (PBL) learning model. The background of this research is based on the low learning outcomes of students and the lack of enthusiasm of students in following the learning of science. This study uses the approach of classroom Action Research (PTK) with models from Kemmis and McTaggart implemented in two cycles. Each cycle consists of planning, action, observation, and reflection. The subjects in this study were 27 students of Class V. Data collection techniques are conducted through observation, learning outcomes tests, and documentation. The results showed that the application of Problem-Based Learning model was able to improve student learning outcomes. The percentage of students ' learning completeness increased from 55% in cycle I to 85% in Cycle II. In addition, students ' learning activities also showed a significant increase, where students became more active in discussions, enthusiastic in finding solutions to environmental problems, and were able to connect pollution materials with everyday life in a critical and reflective manner. Thus, The Problem-Based Learning Learning model proved effective in improving students ' understanding, concern, and learning outcomes on pollution and its impacts.]]>
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