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This research has been studying on the relationship between CAM plants stomatal density and size with their effectiveness to reduce PM 2.5 level in the air. The objective of the study is: 1) To compare the ability of three selected CAM plants to reduce PM 2.5 level 2) To describe the relationship between the density, size of stomata and ability of reducing PM 2.5 dust of three selected CAM plants. The selected three CAM plants are Sansevieria trifasciata, Aechmea fasciata and Sansevieria stuckyi. The study was divided into three sections which are Section 1: Explore the possible related factors and environment, Section 2: Study the ability to reduce the amount of PM 2.5 of three selected CAM plants by measuring PM 2.5 with Air Quality Detector in the test chamber before and after putting the CAM plants then calculate the percentage of PM 2.5 amount that was reduced and Section 3: Measure the density and size of the stomata by taking photo of the stomata under a microscope and calculate with ImageJ program. Then the result was used to study the relationship between the density, size of stomata and ability to reduce PM 2.5 of three selected CAM plants. From the research, we concluded that all selected CAM plants can reduce PM 2.5. The most effective CAM plants to reduce PM 2.5 is Sansevieria stuckyi (33.84%), whereas the least is Aechmea fasciata (19.76%). The plants that have higher stomatal density will have more effectiveness to reduce the level of PM 2.5. There is no relationship between size of CAM plant’s stomata and PM 2.5 level.