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Tangier occupies a strategic position at the northwestern tip of Africa, where the Mediterranean Sea meets the Atlantic Ocean at the Strait of Gibraltar. This coastal city in Morocco's Tanger-Tétouan-Al Hoceïma region sits on a series of hills and plateaus, with elevations ranging from sea level to about 100 meters, creating natural ventilation channels that generally benefit air quality. The urban character blends historic medinas with modern expansion, creating a complex urban-rural gradient where dense urban cores transition to peri-urban areas and agricultural zones. Tangier's location directly influences its air quality through maritime influences—the Atlantic and Mediterranean waters moderate temperatures and provide cleansing sea breezes that disperse pollutants. However, the city's position as Morocco's primary port and industrial hub introduces significant pollution sources, including the Tanger-Med port complex to the east, which handles substantial shipping traffic and associated emissions. The surrounding landscape features the Rif Mountains to the southeast, which can occasionally trap pollutants during stable atmospheric conditions, while the predominantly flat coastal plains to the west allow for better pollutant dispersion. Agricultural areas south of the city contribute biogenic emissions, and the urban expansion along the coast creates a linear pollution corridor. The city's geography as a gateway between continents means it experiences transboundary pollution from maritime shipping and occasional Saharan dust intrusions, though its coastal setting generally provides better air quality than inland Moroccan cities.

Tangier's air quality follows distinct seasonal patterns shaped by its Mediterranean climate with Atlantic influences. During winter (December-February), cooler temperatures and increased rainfall help cleanse the air, though occasional temperature inversions can trap pollutants near the ground, particularly in the city's valleys. This season generally offers the cleanest air, making it favorable for outdoor activities, though sensitive groups should monitor days with stagnant air. Spring (March-May) brings variable conditions—increasing temperatures and reduced precipitation allow pollutant accumulation, especially from port activities and urban traffic, while occasional Saharan dust events from the southeast can elevate particulate levels. Late spring sees the clearest air before summer haze sets in. Summer (June-August) presents the most challenging period for air quality: high temperatures accelerate photochemical reactions creating ground-level ozone, while reduced wind speeds and frequent thermal inversions trap pollutants. The peak pollution typically occurs in July and August, when tourists swell the population and energy demand spikes. Sensitive individuals should limit strenuous outdoor activities during afternoon hours when ozone peaks. Autumn (September-November) offers gradual improvement as temperatures cool and Atlantic winds strengthen, dispersing accumulated pollutants. October often marks a transition to cleaner conditions, though early autumn can still experience residual summer pollution. Throughout the year, the prevailing westerly and northerly winds from the Atlantic provide natural ventilation, making windier days generally better for air quality.