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Meïganga, nestled within the Adamaoua Plateau in Cameroon (6.5300° N, 14.3700° E), presents a unique geographic profile significantly influencing its air quality. The city’s location on the plateau dictates a relatively high elevation, averaging around 1,300 to 1,500 meters above sea level. This elevation contributes to cooler temperatures compared to lower-lying regions of Cameroon, but also fosters the potential for temperature inversions, particularly during the drier months. The surrounding landscape is characterized by undulating hills, savannas, and scattered woodlands, transitioning into more dense forest further afield. Agriculture is a dominant land use in the region, with maize, millet, and sorghum cultivation prevalent, potentially introducing particulate matter from agricultural practices like burning crop residue. While Meïganga itself lacks major industrial zones, its position within the Adamaoua region means it’s connected to agricultural processing centers further north, which could contribute to occasional transport-related pollution. The urban–rural gradient is relatively sharp; the city is surrounded by a predominantly rural agricultural landscape, meaning that dust from unpaved roads and agricultural activities can readily impact air quality within Meïganga. The absence of significant bodies of water nearby limits the natural cleansing effect of humidity and rainfall, further impacting the dispersal of pollutants. The plateau’s topography can also trap pollutants, especially when wind patterns are weak, creating localized air quality challenges.

Meïganga’s tropical savanna climate dictates a distinct wet and dry season cycle, profoundly impacting its air quality. The dry season, typically spanning from November to March, is characterized by lower rainfall and increased dust levels. This period often sees a rise in particulate matter as agricultural activities intensify, including the burning of fields to prepare for planting. Temperature inversions are more frequent during these cooler, drier nights, trapping pollutants close to the ground and exacerbating air quality concerns. The prevailing winds during this season are often light and variable, further hindering pollutant dispersal. The wet season, from April to October, brings increased rainfall, which naturally washes pollutants from the atmosphere, leading to improved air quality. However, heavy downpours can temporarily increase humidity and create localized fog, potentially trapping pollutants in low-lying areas. The increased vegetation growth during the wet season also contributes to higher levels of biogenic volatile organic compounds (BVOCs), which can react with other pollutants to form ozone. Outdoor activities are generally more favorable during the wet season, particularly from June to September. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should exercise caution during the dry season, limiting prolonged outdoor exposure and avoiding areas with visible dust or smoke. The transition months (April/May and October/November) can be unpredictable, with fluctuating rainfall and wind patterns, requiring vigilance regarding air quality conditions.