Pita, a small town nestled within the Mamou Prefecture of Guinea, West Africa, occupies a geographically significant position within the broader Upper Guinea Shield. Located at approximately 11.08°N, -12.40°W, Pita’s terrain is characterized by gently undulating plains, typical of the transition zone between the forested highlands to the north and the drier savanna regions to the south. The elevation is relatively low, averaging around 200-300 meters above sea level, which influences local air circulation patterns. Pita’s proximity to the Niger River basin, though not directly on the river itself, means it experiences a humid subtropical climate, with a distinct wet and dry season. The surrounding landscape is a mosaic of small-scale agriculture – primarily millet, sorghum, and maize – interspersed with shea butter trees and scattered woodlands. This agricultural activity, while vital to the local economy, contributes to particulate matter in the air, particularly during harvesting and burning seasons. The urban–rural gradient around Pita is gradual; the town blends seamlessly into the agricultural landscape, with small villages and farming communities extending outwards. There are no major industrial belts immediately adjacent to Pita, but regional transport routes pass nearby, contributing to vehicle emissions. The relatively flat topography and limited natural barriers can allow pollutants to spread easily, especially during periods of low wind. The town’s location within a region experiencing increasing deforestation further exacerbates air quality challenges, reducing the natural filtering capacity of the landscape.

Pita’s air quality follows a predictable seasonal pattern dictated by its humid subtropical climate. The wet season, typically spanning from June to October, brings frequent rainfall and higher humidity, generally leading to improved air quality as precipitation washes away particulate matter. However, intense storms can temporarily elevate dust levels. The dry season, from November to May, presents a more complex picture. During the early dry season (November-December), cooler temperatures and calmer winds can lead to temperature inversions, trapping pollutants near the ground, particularly those from agricultural burning. As the dry season progresses (January-April), increased agricultural activity, including land clearing by burning, becomes a significant source of smoke and particulate pollution. Dust storms, though less frequent than in the Sahel, can occur, especially during periods of strong Harmattan winds. May marks the transition to the wet season, with gradually increasing rainfall and a corresponding decrease in pollution. The months of February and March are generally the most challenging for air quality, with a combination of agricultural burning and stagnant air. Sensitive groups, including children, the elderly, and individuals with respiratory conditions, should limit outdoor exertion during these periods. During the wet season, while overall air quality improves, vigilance is still needed during heavy rainfall events due to potential flooding and associated mold spores. Maintaining indoor air quality through ventilation and avoiding exposure to smoke from cooking fires is crucial year-round.