KOMPOSISI DAN STRUKTUR VEGETASI RIPARIAN DALAM VARIASI KONSENTRASI PARTICULATE MATTER (PM) DAN KARBON DI KALI KUNING, YOGYAKARTANIM.: 22106040009Ade IdaheryanaauthorRiparian vegetation is an important ecosystem component that can improve air quality through particulate deposition and the uptake of gaseous pollutants. However, the relationship between riparian vegetation and air pollutant concentrations remains insufficiently understood. This study aimed to analyze the composition and structure of riparian vegetation, determine the concentrations of PM2.5, PM10, CO, and CO2, and examine the relationships among riparian vegetation, air pollutants, and environmental parameters. Vegetation data were collected using purposive sampling at three study sites to calculate the Importance Value Index (IVI) and the Shannon–Wiener diversity index (H’). Air pollutant concentrations were measured using a 6-in-1 air quality detector (Model 2CO10), while the relationships among riparian vegetation, air pollutants, and environmental parameters were analyzed using Canonical Correspondence Analysis (CCA). The results showed that the composition and structure of riparian vegetation varied among study sites, with herbaceous vegetation being the dominant growth form. Site 2 had the highest number of species, whereas the highest Shannon–Wiener diversity index was recorded at Site 1. The highest concentrations of PM2.5 and PM10, 26.90 and 35.03 μg/m³, respectively, were recorded at Site 2. The highest CO concentration, 0.61 ppm, was recorded at Site 3, while the highest CO₂ concentration, 494.40 ppm, was recorded at Site 1. CCA indicated that riparian vegetation composition was more closely associated with CO, CO₂, soil moisture, soil pH, and air temperature than with PM2.5 and PM10. Riparian vegetation contributes to air quality regulation through particulate deposition, gaseous pollutant uptake, and microclimate regulation.570 Biologi, Ilmu Hayat2026-08-11UIN SUNAN KALIJAGA YOGYAKARTA;FAKULTAS SAINS DAN TEKNOLOGIThesis