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Enugu, the capital of Enugu State in southeastern Nigeria, sits at approximately 6.5°N latitude and 7.5°E longitude, nestled within the Udi Plateau at an elevation of around 200 meters above sea level. This elevated position, part of the broader Nsukka-Okigwe cuesta landscape, gives the city its nickname 'Coal City' due to the historic coal mining in the region, which has left a legacy of environmental impact. The urban area is characterized by a mix of modern development and older neighborhoods, with a population exceeding one million creating significant urban density. Geographically, Enugu lies in the tropical rainforest zone of Nigeria's interior, though deforestation has altered this landscape. The city is not directly adjacent to major water bodies, with the nearest significant river being the Ekulu River, which flows through the city but is relatively small. Surrounding the urban core are agricultural zones producing crops like yams, cassava, and oil palm, contributing to seasonal biomass burning. The urban-rural gradient shows increasing vegetation and reduced pollution as one moves outward, but the city's position as a regional hub for commerce and transportation means it experiences pollution from vehicle emissions, industrial activities (including remnants of coal processing), and domestic fuel use. This geography—elevated yet landlocked—can trap pollutants under certain weather conditions, particularly during dry seasons when winds are calm, exacerbating air quality issues from both local urban sources and regional agricultural burning.

Enugu experiences a tropical savanna climate with distinct wet and dry seasons, shaping its air quality patterns throughout the year. During the dry season from November to March, pollution typically peaks, especially in December and January, when Harmattan winds blow dust-laden air from the Sahara Desert across West Africa. This period brings hazy conditions with elevated particulate matter, reducing visibility and posing respiratory risks. The cooler, drier air during these months can also lead to temperature inversions in the morning, trapping pollutants near the ground. Sensitive groups, such as those with asthma or cardiovascular conditions, should limit outdoor activities in the early mornings and evenings during peak Harmattan months. The wet season from April to October generally sees improved air quality due to rainfall that washes pollutants from the atmosphere, with June through August being the most favorable for outdoor activities. However, occasional biomass burning from agricultural clearing before rains can cause short-term spikes. The transition months of October and March may experience variable conditions as seasons shift. Throughout the year, urban pollution from vehicles and industry remains a baseline concern, but meteorological factors like wind patterns and precipitation drive seasonal variations. For health guidance, monitoring local air quality reports during Harmattan season is crucial, and using masks or air purifiers indoors can help mitigate exposure during peak pollution periods.