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Oyo, situated in the Cuvette region of the Republic of the Congo, occupies a geographically significant position within the Congo Basin. Located at approximately -1.1603° latitude and 15.9736° longitude, the city’s terrain is characterized by gently undulating plains, typical of the Cuvette’s low-lying landscape. The surrounding area is dominated by dense tropical rainforest, a vital carbon sink and a key factor influencing regional climate patterns. Oyo’s proximity to the Congo River basin, though not directly on a major river, means it experiences high humidity and rainfall, contributing to a consistently warm and moist environment. The urban character of Oyo is likely to be relatively small-scale, reflecting its population of 63,598, with a gradual urban-rural gradient extending outwards into the surrounding rainforest. While detailed industrial data is limited, the Cuvette region is known for its timber extraction and some small-scale agricultural activities, particularly subsistence farming and the cultivation of oil palm. These activities, coupled with potential informal sector operations within the city, can contribute to localized air pollution. The elevation is low, generally below 300 meters, which can exacerbate temperature inversions during certain periods, trapping pollutants closer to the ground. The vast expanse of surrounding rainforest, however, also provides a natural filter, mitigating some of the impacts of human activities, though deforestation can significantly alter this balance. The city’s location within a biodiversity hotspot also means that air quality impacts can have cascading effects on the surrounding ecosystem.

Oyo’s tropical climate dictates a wet and dry season cycle, profoundly influencing its air quality. The wet season, typically spanning from October to May, brings consistent rainfall and high humidity. While the rain naturally helps to cleanse the atmosphere by removing particulate matter, the increased humidity can trap gaseous pollutants, particularly those related to biomass burning. Agricultural practices, including slash-and-burn techniques for land clearing, are more prevalent during the dry season (June to September), leading to significant increases in smoke and particulate pollution. This period often sees a noticeable decline in visibility and a potential increase in respiratory issues. Meteorological conditions play a crucial role; during the dry season, periods of calm winds and temperature inversions are common. Temperature inversions occur when a layer of warm air sits above cooler air near the ground, preventing vertical mixing and trapping pollutants. Fog, which can form during cooler, calmer mornings, further exacerbates this effect. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season, particularly in the mornings. Outdoor activities are generally more favourable during the wet season, although heavy rainfall can still impact visibility and air quality. The consistent humidity throughout the year can also affect comfort levels, making strenuous outdoor exertion challenging. Monitoring for smoke from agricultural fires is essential, and residents should be prepared to limit outdoor exposure during periods of elevated particulate matter.