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Glazoué serves as a pivotal commercial crossroads within the Collines department of central Benin, strategically positioned where the southern coastal plains transition into the undulating hills of the interior. The city's urban character is defined by its role as a transit hub, centered around the bustling markets and the vital North-South highway. This geographic placement creates a distinct urban-rural gradient, where a dense commercial core gives way rapidly to expansive agricultural zones dominated by cashew and yam cultivation. The terrain is characterized by gentle slopes and modest elevations, which generally allow for moderate wind circulation; however, the surrounding savanna landscape plays a critical role in atmospheric composition. During the dry periods, the lack of dense forest cover means that particulate matter from the surrounding rural hinterlands is easily swept into the city center. The proximity to agricultural belts introduces a significant seasonal burden of organic aerosols, primarily from slash-and-burn land preparation. Furthermore, the city's position as a logistics node means that vehicle emissions from heavy-duty trucks transporting goods between Cotonou and the Sahel are concentrated along the main transit corridors. This creates localized pollution hotspots where traffic congestion intersects with the natural dust of the Collines region. Without major bodies of water nearby to provide a cooling, moderating effect on the microclimate, Glazoué's air quality is heavily dictated by the interplay between vehicular exhaust, agricultural combustion, and the prevailing winds of the West African interior and terrain.

In Glazoué, air quality follows a stark binary dictated by the tropical savanna climate, oscillating between the humid wet season and the arid dry season. From May to October, the region experiences heavy precipitation and increased cloud cover, which act as a natural scrubbing mechanism. These rains effectively wash particulate matter and aerosols from the atmosphere, leading to the cleanest air of the year. Conversely, the period from November to April marks a significant decline in air quality. The most critical phase occurs during the Harmattan, typically peaking between December and February, when dry, dust-laden northeasterly winds blow from the Sahara Desert across the Collines. This meteorological phenomenon blankets the city in a fine mineral haze, drastically increasing concentrations of coarse particulate matter. Simultaneously, the dry weather encourages widespread agricultural burning in the surrounding cashew plantations, adding smoke and carbon monoxide to the mix. Temperature inversions during cool December mornings can trap these pollutants near the ground, exacerbating respiratory distress. For sensitive groups, including children and those with asthma, the Harmattan months are the most hazardous, necessitating the use of protective masks and limited outdoor exertion during peak dust events. Outdoor activities are best reserved for the rainy season or the transition months of May and November. Health guidance emphasizes hydration and avoiding the burning of waste during the dry season to prevent further degradation of the local atmospheric environment and protect vulnerable pulmonary systems daily.