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Industrial heat source (IHS) radiation areas are key accumulation zones for fine particulate matter with an aerodynamic diameter of 2.5 μm or less (PM_2.5) in heavily industrialized regions, but PM_2.5 concentration reduction rates by vegetation types have not been systematically assessed. A systematic analysis of PM_2.5 concentration reduction rates by vegetation types using IHS, PM_2.5, land-cover, and digital elevation model (DEM) data was conducted to assess PM_2.5 concentration reduction rates by vegetation types within IHS radiation areas. First, this study adopted the published IHS radiation-area dataset developed by Xin Sui et al. to define the spatial extent of industrially influenced areas. Second, PM_2.5 concentrations were extracted within IHS radiation areas and areas covered by different vegetation types to support the calculation of PM_2.5 concentration reduction rates. Third, PM_2.5 concentration reduction rates by vegetation types were evaluated through masking and regional statistical analysis. Results for Beijing–Tianjin–Hebei (BTH) in 2015 and 2020 show that: (1) the average PM_2.5 decreased from 71.70 to 39.60 µg/m³, corresponding to an overall reduction of 44.8%; (2) PM_2.5 concentration reduction rates varied substantially among vegetation types; open deciduous broadleaved forest showed the highest reduction rate of 39.08%, while rainfed and irrigated cropland showed negative reduction rates of −9.35% and −6.71%; (3) city-scale and case analyses show denser vegetation in radiation zones generally lowers PM_2.5 even under ongoing industrial activity. The study supports vegetation greening, IHS control, regional air quality improvement, and sustainable industrial development strategies. Full article