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Situated along the fertile banks of the Benue River, Makurdi serves as the administrative capital of Benue State, Nigeria, occupying a strategic position within the Guinea Savannah vegetation zone. The city’s topography is characterized by undulating plains and low-lying riverine floodplains, with an elevation averaging approximately 104 meters above sea level. This geographical placement creates a distinct microclimate heavily influenced by the seasonal oscillation of the Inter-Tropical Convergence Zone. The urban character is a blend of dense administrative hubs, bustling market districts, and sprawling residential settlements that transition rapidly into expansive, rural agricultural belts. As the 'Food Basket of the Nation,' the surrounding landscape is dominated by intensive cultivation, which significantly dictates the local aerosol profile. The city’s proximity to the broad, meandering Benue River provides a cooling effect, yet the river valley geography can occasionally trap pollutants during periods of stagnant air. Urban development is concentrated along the north-south transport corridors, where vehicular density is high, often leading to localized pockets of poor air quality. The urban-rural gradient is porous; dust and biomass burning from surrounding farmland frequently drift into the city center, exacerbating the impact of localized traffic emissions. Because Makurdi lacks heavy industrial clusters, the primary drivers of atmospheric degradation are vehicular exhaust, domestic biomass combustion for energy, and the seasonal influx of regional dust. The city’s open, savannah-like structure allows for decent ventilation, yet the expansion of informal settlements continues to challenge urban planning, necessitating a deeper understanding of how these land-use patterns influence the city’s overall ambient air quality profile.

Makurdi experiences two distinct seasons: the wet season and the dry season, both of which fundamentally alter the city’s air quality dynamics. The dry season, spanning from November to March, is the most challenging period for air quality. During these months, the Harmattan winds—a dry, dusty trade wind originating from the Sahara—bring significant particulate matter into the region. Simultaneously, the lack of precipitation prevents the natural wet deposition of pollutants, allowing dust and vehicular emissions to linger in the atmosphere. Temperature inversions are common during the cool early mornings of December and January, trapping ground-level pollutants and creating hazy conditions that persist until the afternoon sun dissipates the layer. Consequently, sensitive groups, including those with asthma or respiratory conditions, should limit strenuous outdoor activities during the early morning hours throughout the peak of the Harmattan. The wet season, occurring from April to October, brings relief as monsoon rains effectively scrub the atmosphere, washing away suspended particulates and significantly improving visibility. During this period, the air feels crisp and oxygen-rich, making it the ideal time for outdoor exercise and recreational activities. However, as the rains taper off in late October, biomass burning associated with land clearing for the upcoming planting season can cause brief, localized spikes in air pollution. Residents are advised to monitor the meteorological transitions closely, as the shift from the wet to the dry season marks a critical period where stagnant air and agricultural burning combine to create the most unfavorable conditions for sensitive individuals throughout the year.