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Boutilimit, situated in the Trarza region of Mauritania at approximately 17.5504°N, -14.7000°W, is a town deeply embedded within the Sahelian landscape. The terrain is predominantly flat, characteristic of the Adrar Plateau’s eastern fringes, transitioning towards the more expansive plains further south. This flatness contributes to limited natural air dispersion. Boutilimit’s elevation is relatively low, increasing its susceptibility to dust and sandstorms originating from the Sahara Desert to the east and north. The town lies inland, a considerable distance from the Atlantic coastline, meaning maritime influences on air quality are minimal. Surrounding Boutilimit are vast expanses of semi-arid grassland and scrubland, supporting a predominantly pastoral economy. Agricultural activity, though present, is limited by water scarcity. The urban-rural gradient is sharp; Boutilimit represents a concentrated settlement within a sparsely populated region. While not a major industrial centre, local artisanal activities and the transport corridor it serves contribute to localised emissions. The lack of significant vegetation cover exacerbates the impact of windblown dust, a defining feature of the region’s air quality challenges. The town’s position within a major trans-Saharan route also means it experiences increased vehicle traffic, further impacting air quality.

Boutilimit experiences a pronounced dry season, roughly from November to June, coinciding with the Harmattan winds blowing from the Sahara. This period sees the most significant deterioration in air quality, as fine particulate matter (dust) dominates. January and February are particularly challenging, with reduced visibility and increased respiratory irritation. The dry heat creates temperature inversions, trapping pollutants near the ground. The brief wet season, from July to October, offers temporary relief. Rainfall suppresses dust, and increased humidity can help settle particles, though localised flooding can create stagnant conditions and promote mould growth. However, even during the wet season, dust transport from surrounding areas remains a factor. November marks a transition period, with decreasing rainfall and the return of the Harmattan. Sensitive individuals – children, the elderly, and those with pre-existing respiratory conditions – should limit outdoor exertion during the dry season, particularly in January and February. Wearing masks can provide some protection. The months of August and September, while still warm, generally offer the best air quality for outdoor activities, though monitoring local conditions remains crucial. The lack of consistent air quality monitoring data makes precise predictions difficult, but understanding these seasonal patterns is vital for public health.