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The purpose of this research is to explore information about student-s argumentation ability in middle school on environmental pollution topic. This research uses descriptive quantitative method. This research was conducted in one of the junior high schools located in Lembang, West Bandung Regency on 29 students of grade 7 as samples that were selected using random sampling techniques. The research instrument used was 6 items essay questions based on indicators of argumentation ability (claim, data, warrant, backing) that have been validated by experts. Student answers were analysed based on the components of the argument. The results showed that 93.10% of students made claims correctly, 54.02% of students presented data, 48.85% of students wrote warrant, and 45.40% of students completed it with backing. Overall it can be concluded that most students have been able to made claims but some of them have difficulty in expressing data, warrant, and backing. The percentage of students argumentation skills can be used as a reference for teachers so that in the future they can determine design or learning activities that are not only focused on understanding concepts but also can build or train students abilities in argumentation.