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Alexandria, Egypt's second-largest city and primary Mediterranean port, occupies a strategic position on a narrow isthmus between the Mediterranean Sea to the north and Lake Mariut to the south, creating a distinctive coastal urban environment that profoundly influences its air quality. Situated at sea level with minimal elevation variation, the city extends along a 32-kilometer coastline, featuring a series of natural harbors and beaches that moderate its climate but also concentrate pollution in the densely populated urban core. Alexandria's geography places it at the northwestern edge of the Nile Delta, where the fertile agricultural lands to the east and south contribute seasonal agricultural burning and dust, while the city itself functions as Egypt's industrial gateway with major port facilities, petroleum refineries, and manufacturing zones concentrated in the western districts. The urban-rural gradient shows intense development along the coastal strip, transitioning to agricultural hinterlands and desert fringes inland, creating complex pollution transport patterns. Alexandria's position exposes it to Mediterranean sea breezes that typically disperse pollutants northeastward, but the city's bowl-like topography between water bodies can trap emissions during calm conditions, particularly when combined with urban heat island effects from its five million residents. The surrounding landscape—flat coastal plain transitioning to desert—means the city lacks natural topographic barriers to pollution dispersion, making it vulnerable to both local emissions and regional dust storms from the Western Desert.

Alexandria's air quality follows a distinct Mediterranean seasonal pattern shaped by its coastal position and urban emissions. During winter (December-February), cooler temperatures and frequent rainfall typically improve air quality by washing particulate matter from the atmosphere, though occasional temperature inversions can trap pollutants near the surface during calm periods, particularly in January when heating emissions increase. Spring (March-May) brings variable conditions with rising temperatures and the khamsin winds from the Sahara, which can carry significant dust loads into the city, creating episodic pollution spikes in April and May that pose respiratory risks. Summer (June-August) features consistently high temperatures and humidity that accelerate photochemical reactions, transforming vehicle and industrial emissions into ground-level ozone, while sea breezes provide some dispersion relief; July and August typically see the highest ozone concentrations, making afternoon outdoor activities challenging for sensitive groups. Autumn (September-November) offers the most favorable air quality as temperatures moderate and wind patterns become more consistent, with October and November providing excellent conditions for outdoor activities before winter rains begin. Sensitive individuals should monitor forecasts for khamsin wind events in spring and ozone advisories in summer, scheduling outdoor exercise for morning hours when pollution levels are generally lower and avoiding prolonged exposure during dust storms or high-temperature periods.