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Nouakchott, Mauritania's coastal capital, occupies a precarious position at the edge of the Sahara Desert and the Atlantic Ocean, creating a unique urban geography that profoundly shapes its air quality challenges. Situated on a low-lying coastal plain with an average elevation of just 7 meters above sea level, the city stretches across sandy terrain with minimal natural vegetation, making it highly susceptible to wind-blown particulates. Its location at 18.0735°N, -15.9582°W places it directly in the path of Harmattan winds that carry Saharan dust from interior desert regions, while its proximity to the ocean provides some moderating influence but also contributes to humidity that can trap pollutants. The urban-rural gradient is stark, with the city's rapid, unplanned expansion into surrounding arid lands creating extensive peri-urban zones where informal settlements practice domestic biomass cooking and waste burning. Nouakchott lacks significant industrial belts or agricultural zones, but its port facilities and fish processing plants along the coastline emit localized industrial emissions. The city's flat topography and lack of geographical barriers allow pollutants to accumulate rather than disperse, while its position between desert and sea creates a convergence zone where marine air masses meet continental dust-laden winds, resulting in complex pollution dynamics that combine anthropogenic sources with natural desert aerosols.

Nouakchott's air quality follows a distinct seasonal pattern driven by the interplay between Saharan dust transport, local emissions, and meteorological conditions. During the peak pollution months from November through March, the Harmattan winds blow consistently from the northeast, carrying dense plumes of Saharan dust that dramatically reduce air quality. These months experience the highest particulate concentrations, with December and January being particularly severe due to temperature inversions that trap pollutants near the surface. Sensitive groups should avoid prolonged outdoor exposure during this period, especially during dust storm events. From April to June, conditions gradually improve as Harmattan winds weaken and occasional rainfall helps settle dust, though vehicle emissions and road dust remain concerns. The summer months of July through October offer the cleanest air, as the West African monsoon brings southwesterly winds from the ocean that push desert dust inland and occasional rainfall scrubs the atmosphere. However, this period sees increased humidity that can combine with fish processing emissions to create localized odor and particulate issues. Fog is rare but can occur in winter months, potentially trapping pollutants. For optimal outdoor activity, visitors should target the late summer to early autumn period, while residents with respiratory conditions should monitor dust forecasts year-round and use protective measures during peak pollution seasons.