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Soubré, situated in southwestern Ivory Coast's Bas-Sassandra District, lies within the tropical rainforest belt of West Africa, approximately 100 kilometers inland from the Atlantic coast. The city occupies a strategic position along the Sassandra River, which flows southward to the Gulf of Guinea, creating a humid, low-lying terrain with an average elevation of 150 meters above sea level. This riverine setting, combined with dense surrounding forests and cocoa-growing agricultural zones, shapes Soubré's urban character as a regional hub for commerce and agro-processing. The city's geography—nestled amidst rolling hills and river valleys—influences air quality through natural ventilation patterns, though the urban core experiences localized pollution from vehicular emissions, biomass burning for domestic energy, and occasional dust from unpaved roads. Proximity to the Sassandra River moderates temperatures but also contributes to humidity that can trap pollutants near ground level. The urban-rural gradient sees cleaner air in outlying villages where forest cover remains intact, contrasting with the city center where traffic congestion and small-scale industries concentrate emissions. Surrounding landscapes include protected areas like the Mont Péko National Park to the north, which acts as a natural air filter, though deforestation for agriculture upwind can introduce particulate matter during dry spells.

In Soubré's tropical climate, air quality fluctuates with distinct wet and dry seasons rather than four temperate seasons. During the long rainy season from April to July, heavy monsoon rains wash pollutants from the air, resulting in the cleanest conditions ideal for outdoor activities like hiking in nearby forests. This period sees reduced biomass burning and dust, with prevailing southwesterly winds from the Atlantic bringing moist, cleaner air. From August to October, a short dry spell occurs, leading to a gradual buildup of pollutants as reduced rainfall allows particulate matter from road dust and agricultural burning to accumulate; sensitive groups like asthmatics should monitor air quality during this time. The main dry season from November to March brings the peak pollution months, characterized by Harmattan winds blowing dust from the Sahara Desert across West Africa. These northeasterly winds carry fine particulate matter that combines with local emissions from vehicles and biomass use, creating hazy conditions that can irritate respiratory systems. Temperature inversions are rare due to consistent warmth, but morning fog in river valleys can temporarily trap pollutants. Health guidance recommends limiting outdoor exertion during Harmattan episodes, especially for children and the elderly, and using masks on dusty days. The best months for air quality are typically May and June, while December and January often see the poorest conditions.