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Gaoua, situated in the Sud-Ouest region of Burkina Faso, is a city deeply embedded within the broader landscape of the Sahel. Located at coordinates 10.3167, -3.1667, the city rests on a plateau, approximately 350 meters above sea level, contributing to a relatively moderate climate compared to lower-lying areas. The surrounding terrain is characterised by savanna grasslands interspersed with rocky outcrops and sparse woodland, typical of the region. Gaoua isn’t proximate to any major bodies of water; its water sources are primarily seasonal streams and groundwater. The urban-rural gradient is quite sharp, with agricultural lands – predominantly subsistence farming of crops like maize, sorghum, and cotton – immediately surrounding the city. While Gaoua isn’t a heavily industrialised centre, small-scale processing of agricultural products and artisanal activities contribute to localised emissions. Dust from unpaved roads and agricultural practices is a significant factor. The city’s position within a broad valley can sometimes trap pollutants, particularly during periods of calm winds. The prevailing Harmattan winds, blowing from the Sahara, can transport significant quantities of dust, impacting air quality, especially during the dry season. This geographical context fundamentally shapes Gaoua’s air quality challenges.

Gaoua experiences a distinct wet and dry season, heavily influencing its air quality. The dry season, roughly from November to May, is characterised by consistently poor air quality. The Harmattan winds, laden with Saharan dust, dominate, reducing visibility and increasing particulate matter concentrations. January and February are typically the worst months, with dust storms common. Temperatures are high, exacerbating the effects of pollutants. The transition to the wet season, around June, brings a temporary improvement as rainfall washes away dust and suppresses airborne particles. However, increased humidity can also promote the growth of mould and allergens. The wet season, lasting until October, generally offers the best air quality, though localised pollution from biomass burning for cooking and agricultural practices remains a concern. August and September, while wetter, can see increased humidity and stagnant air, potentially trapping pollutants. Sensitive groups – children, the elderly, and those with respiratory conditions – should limit outdoor activity during the dry season and be mindful of potential allergen spikes during the wet season. Avoiding strenuous activity during peak dust periods is crucial.