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San-Pédro, situated in southwestern Ivory Coast's Bas-Sassandra District, occupies a strategic position as the nation's second-largest port city after Abidjan, with its urban character defined by its dual role as a major cocoa export hub and a growing industrial center. Nestled along the Gulf of Guinea coastline at coordinates 4.7704°N, -6.6400°W, the city lies on generally flat coastal plains with minimal elevation variation, rarely exceeding 50 meters above sea level, which significantly influences air quality by limiting natural ventilation and pollutant dispersion. The urban landscape transitions from densely populated port and industrial zones in the north to more residential and agricultural areas southward, creating a distinct urban–rural gradient where pollution concentrations typically decrease moving inland. Proximity to the Atlantic Ocean provides some moderating effects through sea breezes, but this is counterbalanced by industrial emissions from the port's shipping activities, cocoa processing facilities, and growing manufacturing sectors concentrated along the northern periphery. Surrounding the city are extensive agricultural zones dominated by cocoa, coffee, and rubber plantations, whose seasonal burning practices contribute particulate matter, while the region's tropical rainforests to the north and east offer limited air purification benefits due to ongoing deforestation pressures. The city's location within the Sassandra River basin further complicates air quality dynamics, as river valley topography can occasionally trap pollutants during stable atmospheric conditions, particularly when combined with urban heat island effects from San-Pédro's expanding concrete infrastructure.

San-Pédro experiences distinct seasonal air quality variations driven primarily by West Africa's monsoon patterns rather than traditional four-season cycles, with pollution levels fluctuating between the dry and rainy periods that characterize this tropical climate. During the long dry season from November to March, northeasterly Harmattan winds transport Saharan dust particles across the region, significantly elevating particulate matter concentrations, particularly in December and January when visibility often reduces and respiratory irritants peak—this period demands caution for asthma sufferers and outdoor activity planning. The transitional months of April and May bring pre-monsoon conditions with reduced dust but increased local pollution from agricultural burning as farmers clear land before rains, creating episodic smoke plumes that affect the city's western outskirts. From June to October, the southwest monsoon delivers heavy rainfall that effectively scrubs pollutants from the atmosphere, resulting in the year's cleanest air, especially during peak precipitation months of June and September when daily showers wash away particulate matter and industrial emissions. However, brief pollution spikes can occur during rare dry spells within the wet season when temperature inversions form overnight in the coastal basin, trapping vehicle emissions and port operations exhaust near ground level until morning sea breezes resume. Sensitive groups including children, elderly residents, and those with cardiovascular conditions should monitor local air quality reports particularly during Harmattan months, scheduling outdoor activities for late afternoons when ocean winds are strongest, while generally favoring the rainy season for extended outdoor exposure when natural cleansing is most effective.