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Malabo, the capital of Equatorial Guinea, occupies a distinctive geographic position on the northern coast of Bioko Island in the Gulf of Guinea, approximately 32 kilometres off the coast of Cameroon. Situated at coordinates 3.7500°N, 8.7833°E, the city lies within the Bioko Norte province and is characterised by a humid subtropical climate that profoundly influences its air quality dynamics. The urban area is nestled between the Atlantic Ocean to the north and the steep, volcanic slopes of the Pico Basile mountain range to the south, which rises to over 3,000 metres, creating a dramatic topographic contrast. This elevation gradient traps pollutants in the lower-lying coastal zones, particularly during periods of atmospheric stability. Malabo's port, a hub for oil and gas exports, along with industrial activities concentrated along the waterfront, contributes significantly to local emissions, while the city's compact urban core experiences high vehicle density and road dust. The surrounding landscape transitions rapidly from urban development to lush tropical rainforest and agricultural zones, though the urban–rural gradient is sharp due to the island's limited land area. Proximity to the ocean moderates temperatures but also facilitates the transport of marine vessel emissions and occasional sea spray, which can interact with anthropogenic pollutants. The city's location on a small island means pollution sources are relatively concentrated, with limited dispersion pathways except during strong oceanic winds, making geographic context crucial for understanding air quality challenges in this equatorial capital.

In Malabo's humid subtropical climate, air quality exhibits distinct seasonal patterns driven by meteorological factors rather than extreme temperature variations. During the dry season from December to February, northeasterly Harmattan winds occasionally bring dust from the Sahara, though this is less pronounced than on the mainland, while generally stable conditions and lower rainfall allow pollutants from vehicle exhaust, port emissions, and waste burning to accumulate, particularly in the urban basin. The peak pollution months of June, July, and August coincide with the rainy season, when increased humidity and reduced wind speeds create atmospheric stagnation, trapping emissions from oil and gas operations and road dust that is stirred up by seasonal downpours. This period also sees heightened activity in the port sector, exacerbating local pollution levels. From September to November, the transition to the short dry season brings more variable winds and occasional thunderstorms, which help disperse pollutants, making this a relatively favourable time for outdoor activities. Sensitive groups, such as those with respiratory conditions, should exercise caution year-round but particularly during the peak summer months when pollution concentrations are highest. Health guidance includes avoiding strenuous outdoor activities during midday when ozone levels may peak, using air purifiers indoors, and monitoring local air quality advisories, especially during periods of low wind and high humidity. The lack of strong seasonal temperature inversions typical of temperate cities is offset by the island's topographic constraints, which amplify pollution episodes during calm weather conditions.