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Dambulla, nestled in the Central province of Sri Lanka, occupies a geographically significant position within the island’s cultural triangle. Located at approximately 7.86°N, 80.65°E and an elevation of around 330 meters above sea level, the city is dramatically sculpted by the surrounding landscape. It sits at the foot of the Dambulla rock, a massive granite outcrop rising abruptly from the surrounding plains, a feature that heavily influences local air circulation patterns. The terrain is predominantly undulating, transitioning from gently sloping agricultural lands to steeper, forested hillsides. This creates a complex topography that can trap pollutants, particularly during periods of low wind. Dambulla’s proximity to the Matale and Kurunegala districts places it within a region characterized by a gradual urban–rural gradient. While Dambulla itself is a growing urban center, it is surrounded by extensive agricultural zones, primarily focused on coconut, paddy, and fruit cultivation. These agricultural practices, while vital to the local economy, can contribute to localized air pollution through the use of fertilizers and occasional burning of crop residue. The relatively close proximity to the Victoria Reservoir, though not directly adjacent, influences humidity levels and can impact the dispersion of airborne particles. The surrounding landscape, a mix of cultivated fields, scattered villages, and forested areas, contributes to a generally rural atmosphere, but increasing vehicular traffic and limited industrial activity within the city itself are beginning to alter the air quality profile.

Dambulla experiences a tropical climate with distinct wet and dry seasons, significantly impacting its air quality dynamics. The dry season, typically spanning from January to March, often sees a build-up of pollutants due to reduced rainfall and lower wind speeds. Temperature inversions, common during these months, trap cooler air near the ground, preventing the vertical dispersion of particulate matter and gaseous pollutants. This period is generally less favourable for outdoor activities, particularly for individuals with respiratory sensitivities. The southwest monsoon (May to August) brings increased rainfall and stronger winds, effectively cleansing the atmosphere and significantly reducing pollution levels. However, heavy rainfall can also lead to increased humidity, which can exacerbate respiratory issues for some. The inter-monsoon periods (September-October and November-December) are characterized by fluctuating weather patterns, with periods of calm and stagnant air interspersed with gusty winds. These periods can be unpredictable for air quality. November and December often see increased agricultural burning in surrounding areas, contributing to localized smoke and particulate matter. During the wettest months (June-August), air quality generally improves considerably. Sensitive groups, including children, the elderly, and those with pre-existing respiratory conditions, should exercise caution during the dry season and be mindful of potential agricultural burning during the inter-monsoon periods. Staying indoors during periods of stagnant air and avoiding strenuous outdoor activity are recommended strategies.