Moundou Air Quality Index (AQI)

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Moundou, the capital of Logone Occidental in Chad, occupies a strategically important position along the Logone River, a vital artery for trade and transportation within the region. Situated at approximately 8.5667° N, 16.0833° E, the city’s geography is characterized by a relatively flat alluvial plain, a consequence of the Logone’s persistent deposition of sediment. The surrounding landscape is a mosaic of savanna grasslands and riparian forests, transitioning into drier Sahelian scrubland further inland. Elevation is low, averaging around 280 meters above sea level, contributing to a tendency for pollutants to accumulate, particularly during periods of atmospheric stability. Moundou’s location within a transitional zone between the Sahel and Sudanian savannas influences its climate and, consequently, its air quality. The Logone River itself moderates temperatures locally, but also introduces humidity, which can trap particulate matter under certain meteorological conditions. While large-scale industrial zones are limited, the city serves as a regional hub for agricultural processing, with significant activity related to cotton and groundnut cultivation in the surrounding areas. This agricultural activity, coupled with reliance on biomass fuels (wood and charcoal) for cooking and heating, represents a key source of localized air pollution. The urban-rural gradient around Moundou is gradual, with smaller villages and agricultural fields blending into the urban fabric, further complicating air quality management due to diffuse pollution sources.

Moundou experiences a distinct wet and dry season, profoundly impacting its air quality profile. The dry season, typically spanning from November to April, is characterized by lower rainfall and increased dust intrusion from the surrounding Sahel. Reduced precipitation means less atmospheric cleansing, allowing particulate matter to persist for longer periods. Temperature inversions, common during the cooler nights of the dry season, trap pollutants close to the ground, exacerbating respiratory issues. Wind patterns during this period are often light and variable, further hindering pollutant dispersion. The months of January and February often see the poorest air quality, with increased respiratory complaints reported locally. Conversely, the wet season (May to October) brings relief through frequent rainfall, which effectively washes pollutants from the atmosphere. However, the onset of the monsoon can also introduce high humidity, which, while reducing dust, can trap other pollutants, particularly those associated with biomass burning. Agricultural activities intensify during the wet season, leading to increased emissions from field burning, a practice used for land clearing and residue disposal. Fog, particularly in the early mornings during the transition periods between seasons, can also trap pollutants, creating localized pockets of poor air quality. Sensitive groups, including children, the elderly, and individuals with pre-existing respiratory conditions, should exercise caution during the dry season and be mindful of potential smoke exposure during the wet season’s agricultural burning periods.