<![CDATA[The increasing air pollution, particularly from fine particulate matter (PM_2.5), poses a significant challenge in maintaining indoor air quality. PM_2.5 is categorized as a small dust particle and suspended in the air, and easily inhaled, potentially causing health problems. This study aims to analyze indoor PM_2.5 concentrations based on cleanliness levels and human activity. Measurements were taken using a particle counter at 2-second intervals for 30 seconds under four conditions: clean room without occupants, dirty room without occupants, dirty room with occupants, and dirty room with additional activity. The results showed a clear increase in PM?.? concentration with greater activity, from 12.7 µg/m³ in clean rooms without people to 29.6 µg/m³ in dirty rooms with added activity. These findings indicate that human presence and physical movement significantly contribute to airborne fine particle levels. Therefore, the use of electrostatic filters is considered an effective and efficient solution for reducing fine particle concentrations and improving indoor air quality.]]>
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