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Gaalkacyo, situated in Somalia's Mudug region at coordinates 6.7697°N, 47.4308°E, occupies a strategic position in the Horn of Africa's semi-arid interior. The city straddles the boundary between Somalia's northern and southern administrative zones, functioning as a vital trade and transport hub connecting coastal ports to inland pastoral areas. Located approximately 750 kilometers northeast of Mogadishu, Gaalkacyo lies on relatively flat terrain with an elevation around 300 meters above sea level, characterized by sparse acacia savanna and seasonal grasslands. The urban area extends across both sides of a seasonal riverbed that remains dry for much of the year, creating dust sources during arid periods. Surrounded by vast pastoral rangelands with minimal industrial development, the city's air quality is primarily influenced by local urban emissions rather than regional industrial belts. Proximity to the Indian Ocean (about 250 kilometers east) provides some maritime influence, though this is moderated by the intervening Haud plateau. The urban-rural gradient shows concentrated pollution sources in the densely populated central districts, transitioning to cleaner air in peripheral nomadic settlement areas. Geographic factors exacerbating air pollution include the city's location in a rain shadow region, limited vegetation to trap particulates, and terrain that facilitates dust transport from surrounding arid lands during dry seasons.

Gaalkacyo experiences distinct seasonal air quality patterns shaped by Somalia's monsoon climate, though specific AQI measurements remain unverified. During the December-February Jilal dry season, northeasterly monsoon winds transport dust from surrounding arid lands, creating hazy conditions with elevated particulate levels—this period typically sees the poorest air quality, particularly in January when temperatures are cooler and atmospheric mixing is reduced. The March-May Gu rainy season brings cleansing rains that temporarily wash pollutants from the air, though humidity can occasionally trap urban emissions near the surface. June-September marks the Hagaa dry season with strong southwest monsoon winds that disperse local pollution but may carry dust from distant sources, creating variable conditions. The October-November Deyr rainy season offers another period of improved air quality as precipitation returns. Sensitive groups including children, elderly residents, and those with respiratory conditions should limit outdoor exertion during peak dry months when dust concentrations are highest. The optimal period for outdoor activities generally falls during the rainy seasons when natural cleansing occurs, though even then, urban emissions from vehicles and generators persist. Meteorological factors particularly affecting pollution include temperature inversions during cool dry nights that trap emissions, occasional fog during transitional months that combines with particulates, and wind patterns that either disperse or concentrate pollutants depending on direction and intensity.