We measured the atmospheric concentrations of fine particulate matter (PM_2.5) and polycyclic aromatic hydrocarbons (PAHs) on every Tuesday from 2016 to 2019 to reveal the characteristics of PM_2.5 pollution in a suburban residential area of Saitama Prefecture, a commuter town of Tokyo, and obtained the following results. First, mean PM_2.5 concentration over four years was 15.3 µg/m³, which was slightly higher than the long-term environmental standard of 15 µg/m³. Second, extremely high PM_2.5 concentrations may have been caused by the arrival of the Yellow Sand; a high PAH concentration was also observed during this event. Third, in the area surrounding the fields, PM_2.5 as well as PAH concentrations were increased from autumn to winter owing to open burning of biomass. Finally, the PM_2.5 concentration in the suburban areas surrounding the fields was 70% of that in central Tokyo, and the PAH concentration in late winter was the same as that in central Tokyo. These findings suggest that PM_2.5 and PAH concentrations in the suburban area surrounding the fields were high despite the area’s low population density because of PM_2.5 accumulation in the metropolitan area and PM_2.5 emission from biomass burning. To improve the living environment of suburban residential areas surrounding fields, it is necessary to restrict biomass burning.