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Mabole, nestled in the Western Province of Sri Lanka (7.0022° N, 79.8980° E), occupies a geographically significant position within the island nation’s southwestern lowlands. The town’s location, approximately 15km inland from the coastal belt, places it within a transitional zone between the coastal plains and the gently undulating terrain of the interior. Mabole’s elevation is relatively low, averaging around 30 meters above sea level, contributing to a warm and humid climate characteristic of the region. The surrounding landscape is a mosaic of small-scale agriculture – predominantly rice paddies and coconut plantations – interspersed with residential areas and pockets of scrubland. This agricultural activity, while vital to the local economy, can contribute to localized air pollution through the burning of agricultural waste and the use of fertilizers. The proximity to the coast, while moderating temperatures somewhat, also means Mabole is susceptible to sea breezes which can transport pollutants from coastal industrial areas or, conversely, disperse local emissions. The urban–rural gradient around Mabole is gradual; the town itself exhibits a modest urban character with a developing infrastructure, but it quickly blends into the rural agricultural landscape. The absence of major heavy industries directly within Mabole is a mitigating factor, but the town’s connectivity to larger urban centers like Colombo, via road networks, means it can be affected by transboundary pollution events. The relatively flat terrain can also exacerbate the accumulation of pollutants, particularly during periods of low wind speed.

Mabole’s tropical climate dictates a seasonal pattern of air quality influenced primarily by the monsoon cycles. The southwest monsoon (May to September) brings consistent rainfall and strong winds, generally leading to improved air quality as pollutants are washed out and dispersed. This period is typically the most favourable for outdoor activities, although occasional heavy downpours can temporarily reduce visibility. Conversely, the northeast monsoon (December to March) is characterized by drier conditions and calmer winds, creating a more stable atmospheric environment. This stability can lead to temperature inversions, particularly during the cooler nights, trapping pollutants closer to the ground and potentially increasing localized concentrations. The inter-monsoon periods (April and October/November) are transitional, with variable weather patterns. April often sees a build-up of dust and particulate matter as the southwest monsoon approaches, while November can experience hazy conditions due to agricultural burning in surrounding areas. The warmer months (March-May) tend to have higher levels of ground-level ozone, formed through photochemical reactions involving sunlight and pollutants. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the drier months, particularly during periods of stagnant air. Avoiding strenuous outdoor activity during the hottest part of the day and ensuring adequate ventilation indoors are recommended. The increased humidity during the monsoon season can exacerbate respiratory issues for some, so maintaining indoor air quality is also important year-round.