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Dikwella South, nestled along the southern coastline of Sri Lanka, occupies a geographically significant position within the Southern Province. Located at approximately 5.9667° N, 80.6833° E, the town’s urban character is intrinsically linked to its coastal setting and the surrounding landscape. The terrain is predominantly low-lying, gently sloping towards the Indian Ocean, with elevations rarely exceeding 30 meters above sea level. This flatness contributes to a relatively uniform wind pattern, though coastal breezes are a dominant feature. Dikwella’s proximity to the ocean moderates temperatures, but also introduces the potential for salt spray and marine-derived particulate matter impacting air quality. The surrounding landscape is a mosaic of coconut plantations, small-scale agriculture (primarily rice and vegetables), and scrubland, creating a gradual urban–rural gradient. While Dikwella itself is a developing town, it benefits from its position along the main southern highway, facilitating transport and trade. There are no major industrial belts immediately adjacent to Dikwella; however, larger industrial zones are present further inland, potentially contributing to regional pollution drift. The Weeri River flows nearby, influencing local humidity and potentially impacting the dispersion of pollutants. The coastal location, combined with the agricultural activity and regional transport links, shapes the unique atmospheric conditions experienced in Dikwella South, influencing both natural and anthropogenic air quality factors.

Dikwella South experiences a tropical climate characterized by distinct wet and dry seasons, significantly influencing its air quality profile. The southwest monsoon, typically from May to September, brings consistent rainfall and increased humidity. This period generally sees improved air quality due to frequent precipitation washing away particulate matter and increased wind speeds dispersing pollutants. However, heavy rainfall can also lead to increased soil erosion and dust events, temporarily degrading air quality. The dry season, from October to April, is marked by lower rainfall and higher temperatures. During these months, particularly in March and April, stagnant air conditions and temperature inversions can occur, trapping pollutants closer to the ground. The lack of rainfall allows accumulated dust and emissions from vehicles and agricultural activities to build up. Fog, though infrequent, can also exacerbate this issue, further reducing visibility and concentrating pollutants. The agricultural practices prevalent in the surrounding areas, such as burning of crop residue after harvest (typically in February/March), can contribute to localized spikes in particulate matter. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, particularly during periods of stagnant air or fog. Outdoor activities are generally more favorable during the monsoon months, although caution should be taken during heavy rainfall events due to potential flooding and associated dust.