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Fāqūs sits nestled within the fertile expanse of the eastern Nile Delta in the Ash Sharqīyah Governorate, serving as a critical node between rural hinterlands and urban centers. The terrain is quintessential deltaic—exceptionally flat and composed of rich alluvial deposits that support intensive agriculture. This low-lying topography prevents the natural flushing of pollutants through mountainous wind currents, often trapping particulate matter near the ground. The city is surrounded by a dense tapestry of cropland and irrigation canals, creating a humid microclimate that can exacerbate the suspension of aerosols. Its regional position makes it a transit point for agricultural goods, leading to a concentrated urban-rural gradient where diesel emissions from heavy transport mingle with organic aerosols from farming activities. While the proximity to water bodies provides some localized cooling, the lack of significant elevation means that temperature inversions are common during cooler months, pinning pollutants over the residential core. To the east, the transition toward the more arid landscapes of the governorate exposes Fāqūs to aeolian dust transport. The urban character is defined by a dense central core expanding into sprawling agricultural fringes, where the burning of crop residues—particularly rice straw—introduces significant seasonal spikes in smoke and fine particulate matter. Consequently, the city's air quality is a complex interplay between its role as an agrarian market town and its vulnerability to the stagnant air masses characteristic of the flat, humid Nile Delta plains. This geographic convergence of intensive land use and low atmospheric dispersion creates a persistent challenge for respiratory health.

Air quality in Fāqūs follows a rhythmic cycle dictated by agricultural calendars and Mediterranean weather. Winter brings a cooling effect, but it also introduces dangerous temperature inversions that trap vehicle exhaust and heating smoke close to the surface, particularly in December and January. During these months, sensitive groups should limit prolonged outdoor exertion during the early morning fog. Spring is often the most challenging period due to the Khamasin winds. These hot, dry gusts sweep across the eastern deserts, transporting massive quantities of mineral dust and sand into the city, causing sudden spikes in particulate matter throughout April and May. Summer offers a period of relative atmospheric instability; while temperatures soar, stronger convective currents often lift pollutants higher into the troposphere, though ozone levels can rise due to intense solar radiation reacting with nitrogen oxides. The most critical window occurs in autumn, specifically during the harvest months of September and October. This period is marked by the traditional burning of rice straw, creating a thick, acrid haze known locally as the "black cloud." This seasonal smog drastically reduces visibility and increases respiratory distress. For those with asthma or chronic obstructive pulmonary disease, autumn is the most hazardous season, requiring strict adherence to indoor environments during peak burning hours. By November, as the harvest concludes and winds shift, the air typically clears, marking a brief trough in pollution before the winter inversions return to the flat delta landscape. This cycle requires residents to adapt their daily activities to prevailing meteorological and agricultural conditions.