<![CDATA[This study investigates the concentration and dispersion patterns of PM in Pekanbaru, Indonesia, from January to November 2024, using a combination of air quality data and HYSPLIT trajectory modeling. The analysis identifies the peak PM concentration on September 22–23, 2024, reaching 55.74 µg/m³, which corresponds to an Air Quality Index (AQI) value of 131—classified as "Unhealthy for Sensitive Groups." Monthly PM levels fluctuated significantly due to meteorological influences such as rainfall, wind speed, humidity, and temperature inversions. The dry season (June to October), characterized by low precipitation and stagnant wind conditions, showed the highest PM values, while the wet months demonstrated a cleansing effect through wet deposition. HYSPLIT backward trajectory modeling revealed that pollutants reaching Pekanbaru originated from the northwest, possibly linked to biomass burning and forest fires in adjacent provinces such as West Sumatra. Dispersion maps showed pollutant accumulation hotspots in densely populated areas like Jalan Bandeng and Tangkerang Tengah, where traffic and household emissions contributed heavily. Moreover, meteorological factors must be continuously monitored to predict and manage pollution events effectively, especially in urban tropical environments like Pekanbaru.]]>
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