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Monkey Bay, nestled on the southern shore of Lake Malawi in the Mangochi District of Malawi, occupies a geographically significant position. The town’s location directly influences its air quality dynamics. Situated at approximately 14.07°S, 34.92°E and a modest elevation of around 400 meters above sea level, Monkey Bay benefits from the moderating influence of the vast Lake Malawi, a major body of water that helps to regulate local temperatures and humidity. The surrounding landscape is characterized by a mix of undulating hills and fertile plains, largely dedicated to agricultural activities, particularly tobacco and maize cultivation. This proximity to agricultural zones introduces potential sources of particulate matter, especially during harvesting and drying seasons. The urban–rural gradient around Monkey Bay is relatively gradual; the town itself is a small commercial hub, transitioning quickly into rural agricultural landscapes. While there are no major industrial belts immediately adjacent to Monkey Bay, the town serves as a trading post for surrounding communities, leading to vehicular traffic and associated emissions. Prevailing winds generally blow from the lake, which can disperse pollutants, but also carry moisture and occasionally, dust from the surrounding agricultural lands. The terrain, with its gentle slopes, can contribute to localized air stagnation under certain meteorological conditions, potentially trapping pollutants near the surface. The lake's influence also means that humidity levels are generally high, which can affect the dispersion of certain pollutants.

Monkey Bay’s tropical climate dictates a distinct wet and dry season pattern, profoundly impacting air quality. The dry season, typically spanning May to October, often sees a slight increase in particulate matter concentrations. This is largely attributable to agricultural practices; the burning of crop residues after harvest, a common practice in the region, releases significant amounts of smoke and particulate pollution. While the lake breeze provides some dispersion, periods of calm winds can lead to localized accumulation, particularly in the evenings. The dry season also tends to be hotter, which can exacerbate respiratory issues. The wet season, from November to April, brings frequent rainfall and significantly higher humidity. The rain effectively ‘washes’ the air, removing particulate matter and generally improving air quality. However, periods of intense rainfall can sometimes lead to flooding, which can stir up dust and mold spores, temporarily degrading air quality. Fog, though infrequent, can occur during the cooler months, trapping pollutants close to the ground. During the transition months (April/May and October/November), the combination of decreasing rainfall and shifting wind patterns can create unstable atmospheric conditions, potentially leading to short periods of elevated pollution. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, particularly during periods of agricultural burning. Outdoor activities are generally more favorable during the wet season, although vigilance regarding potential flooding-related air quality issues is still advised.