Sri Lanka’s rapid urbanization, industrialization, and increasing vehicular emissions have raised significant concerns about deteriorating air quality, mostly in densely populated regions such as Colombo, Gampaha, and Kandy. This study aimed to assess the spatial variability of urban air pollutants using a combination of ground-based measured data and Geographic Information System (GIS) mapping. The research examined distributions of particulate matter (PM10), nitrogen dioxide (NO2), sulfur dioxide (SO2), carbon monoxide (CO), and ozone (O3) concentrations over the past 4 years. This study identified pollution hotspots and analyzed the distribution of air quality across the Gampaha district in Sri Lanka by using available atmospheric data in the Energy and Environ-mental Services Department of the National Engineering Research and Devel-opment Center of Sri Lanka. The findings highlighted the urgent need for tar-geted air quality management policies and suggested working frameworks for citizens within. This research highlights the importance of localized environ-mental conditions in shaping adaptive responses to urban air pollution in Sri Lanka.