Loading air quality context...

Lomé, Togo's coastal capital in the Maritime Region, occupies a strategic position on the Gulf of Guinea, with its urban fabric stretching along a narrow coastal plain backed by lagoons and low-lying terrain. The city's geography profoundly shapes its air quality: situated at just 10 meters above sea level, Lomé experiences limited natural ventilation, allowing pollutants to accumulate rather than disperse. To the north, the terrain gently rises toward the Togo Mountains, but this elevation gradient is insufficient to create significant air drainage that might clear the basin. The Atlantic Ocean to the south provides some moderating influence, yet onshore breezes often stall over the urban area, trapping emissions from the bustling port—one of West Africa's busiest—and from dense vehicular traffic on poorly maintained roads. Lomé's urban–rural gradient is sharp: the city core merges into peri-urban zones with informal settlements and agricultural patches, where domestic biomass cooking and waste burning add to the pollution mix. The surrounding landscape includes the Lake Togo lagoon system to the east, which can foster humidity and fog, exacerbating particulate matter retention. Proximity to the Ghana border and its industrial belt to the west means transboundary pollution occasionally drifts in, compounding local sources. This coastal, low-elevation setting, combined with rapid urbanization and limited green spaces, creates a geographic trap for airborne contaminants, making Lomé particularly vulnerable to persistent air quality issues.

Lomé's humid subtropical climate drives a distinct seasonal air quality narrative, with pollution peaking sharply from November to February during the dry harmattan season. In these months, northeasterly winds from the Sahara Desert sweep dust and fine particulates into the city, combining with local emissions from vehicles, port activities, and domestic biomass use. Reduced rainfall and frequent temperature inversions trap pollutants near the ground, leading to hazy conditions and elevated health risks—sensitive groups like children, the elderly, and those with respiratory conditions should limit outdoor exertion, especially in the mornings when inversions are strongest. From March to May, the pre-monsoon period brings sporadic rains that temporarily wash pollutants from the air, offering brief respites, though humidity can increase ozone formation. The rainy season from June to October sees the lowest pollution levels, as monsoon winds from the southwest and heavy precipitation scour the atmosphere, dispersing contaminants; this is the optimal time for outdoor activities, with clearer skies and reduced exposure. However, high humidity during this period can exacerbate mold and allergen issues indoors. Throughout the year, localized factors like waste burning and generator exhaust during power outages add episodic spikes, but the overarching pattern is one of wintertime accumulation and summertime cleansing, guided by the interplay of harmattan winds, monsoon cycles, and coastal meteorology.