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Djougou, situated in northwestern Benin's Donga Department at coordinates 9.7000°N, 1.6667°E, occupies a strategic position as the largest city in northern Benin and a vital commercial hub connecting Benin with neighboring Togo and Burkina Faso. The city lies within the Sudanian savanna ecoregion at an elevation of approximately 431 meters above sea level, characterized by gently rolling terrain with scattered inselbergs and lateritic plateaus that influence local air circulation patterns. Djougou's urban character reflects its role as a regional market center, with a population of 237,040 creating a distinct urban-rural gradient where the compact urban core transitions to surrounding agricultural lands and natural vegetation. The city's location away from major water bodies—with the nearest significant river being the Pendjari River about 100 kilometers to the northwest—means it lacks the moderating influence of large aquatic systems on air quality. Surrounding landscapes consist primarily of cultivated fields, particularly for cotton, maize, and yams, interspersed with patches of woodland and shrub savanna. This agricultural belt contributes to seasonal biomass burning and dust generation, while the city's position along major transport corridors brings vehicle emissions from regional trade. The urban geography features a radial pattern from the central market, with residential areas expanding outward amid limited industrial activity beyond small-scale processing and artisanal workshops. Djougou's elevation provides some natural ventilation compared to lower-lying areas, but its inland position in the Sudanian climate zone subjects it to distinct seasonal air quality variations influenced by regional weather patterns and local human activities.

Djougou experiences distinct seasonal air quality patterns shaped by the Sudanian climate's wet-dry cycle, with pollution levels fluctuating according to meteorological conditions and human activities. During the dry season from November to March, air quality typically deteriorates as Harmattan winds transport Saharan dust from the northeast, creating hazy conditions with elevated particulate matter concentrations. December through February represents the peak pollution period when temperature inversions trap pollutants near the surface during cool nights, compounded by increased biomass burning for land clearance and domestic heating. Sensitive groups including children, elderly residents, and those with respiratory conditions should limit prolonged outdoor exposure during these months, particularly in early mornings when inversion layers are strongest. The transition to the rainy season from April to June brings temporary relief as convective rainfall scrubs pollutants from the atmosphere, though initial rains may temporarily increase mold spores and organic particulates. July through September offers the cleanest air conditions with regular precipitation, higher humidity, and prevailing southwesterly monsoon winds dispersing local emissions. However, occasional stagnant conditions between rain events can briefly concentrate pollutants. October marks another transitional period as rains diminish and agricultural burning increases ahead of the dry season, creating variable air quality. For optimal outdoor activity, visitors and residents should favor the early rainy season months of May and June when temperatures are moderate and pollution levels lowest. Throughout the year, morning hours generally provide better air quality than afternoons when thermal turbulence mixes pollutants downward, and sensitive individuals should monitor local visibility as an indicator of particulate levels.