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This study improves traditional PM 2.5 estimation models by combining an hourly aerosol optical depth from the Advanced Himawari Imager onboard Himawari-8 with a newly introduced predictor to estimate hourly PM 2.5 concentrations in the Beijing–Tianjin–Hebei (BTH) region from November 1, 2018 to October 31, 2019. The new predictor is an hourly PM 2.5 forecasting product from the Model of Aerosol Species IN the Global AtmospheRe (MASINGAR). Comparative experiments were conducted by utilizing three extensively used regression models, namely, multiple linear regression (MLR), geographically weighted regression (GWR), and linear mixed effects (LME). A ten-fold cross validation (CV) demonstrated that the MASINGAR product significantly improved the performances of these models. The introduced product increased the model's determination coefficients (from 0.316 to 0.379 for MLR, from 0.393 to 0.445 for GWR, and from 0.718 to 0.765 for LME), decreased their root mean square errors (from 38.2 μg/m3 to 36.4 μg/m3 for MLR, from 36.0 μg/m3 to 34.4 μg/m3 for GWR, and from 24.5 μg/m3 to 22.4 μg/m3 for LME) and mean absolute errors (from 25.2 μg/m3 to 23.3 μg/m3 for MLR, from 23.5 μg/m3 to 21.8 μg/m3 for GWR, and from 15.2 μg/m3 to 13.7 μg/m3 for LME). Then, a well-trained LME model was utilized to estimate the spatial distributions of hourly PM 2.5 concentrations. Highly polluted localities were clustered in the central and southern areas of the BTH region, and the least polluted area was in northwestern Hebei. Seasonal PM 2.5 levels averaged from the hourly estimations exhibited the highest concentrations (55.4 ± 56.8 μg/m3) in the winter and lowest concentrations (25.1 ± 18.2 μg/m3) in the summer. Introducing the PM 2.5 products from MASINGAR can significantly improve the performance of traditional models for surface PM 2.5 estimations by 7–20%. Image 1 • A new predictor was introduced to improve three widely used PM2.5 estimating models. • The LME model was enhanced by the MASINGAR predictor (R 2: 0.718 vs 0.765). • The daytime PM 2.5 exhibited a distinct variation with the highest value at 1000 LT. • The central and southern BTH region had a high polluted level. [ABSTRACT FROM AUTHOR]