Abidjan Air Quality Index
Abidjan — West Africa’s commercial capital and Côte d’Ivoire’s economic engine — sits across the Ébrié Lagoon in a topology that limits natural ventilation. With 5 million people, a growing vehicle fleet, and an industrial port corridor, the city faces a moderate but rising pollution challenge. Two rainy seasons per year provide relief that many peer cities don’t have.
Monthly AQI Pattern
Two rainy seasons bring relief; Harmattan peaks December–February
Annual Pollutant Levels
| Pollutant | Abidjan | WHO | Excess |
|---|---|---|---|
| PM2.5 | 30 μg/m³ | 5 μg/m³ | 6.0× |
| PM10 | 62 μg/m³ | 15 μg/m³ | 4.1× |
| NO₂ | 28 μg/m³ | 10 μg/m³ | 2.8× |
| SO₂ | 12 μg/m³ | 40 μg/m³ | 0.3× |
| O₃ | 45 μg/m³ | 60 μg/m³ | 0.8× |
Lagoon Geography: Beautiful but Trapping
Abidjan’s unique urban geography — built across islands and peninsulas of the Ébrié Lagoon — is both its architectural identity and its pollution constraint. The lagoon system creates micro-basins where air can stagnate, particularly during the dry season when Atlantic sea breezes are weakest and Harmattan winds are light.
The Plateau business district, Adjamé commercial hub, and Abobo densely populated quarter all sit in zones with limited natural flushing. The open Atlantic coastline to the south (Grand-Bassam corridor, Cocody bay) benefits from sea breezes. Port-Bouët, despite proximity to the industrial zone, often records cleaner air than inland Adjamé thanks to ocean ventilation.
Health Advisory by Season
Harmattan dust increases PM10. Sensitive groups (respiratory conditions, elderly) should wear masks outdoors. Close windows during peak Harmattan days when visibility is low.
Improving conditions. Generally safe for most outdoor activity. Sensitive individuals should monitor AQI and limit exercise on days above 100.
Rainy season provides relief. Good for outdoor activity. Brief second dry period in July–August can push AQI to 70s — still acceptable.
Second rainy season keeps air reasonable. Construction activity peaks in the run-up to dry season, slightly elevating PM10 near development sites.
West Africa City Comparison
Annual average AQI 2024. Abidjan highlighted.
Frequently Asked Questions
What is Abidjan's AQI and how does it compare to other West African cities?
Abidjan's annual average AQI is approximately 84 (Moderate), with PM2.5 of 30 μg/m³ — six times the WHO annual guideline. This places it mid-tier among West African cities: worse than Dakar (72) and Abuja (68), but better than Lagos (115) and Accra (90). Abidjan's dual rainy seasons (April–June, September–November) provide relief that single-season West African cities lack. Dry season months (January–February, July–August) push into Unhealthy territory.
How does Abidjan's lagoon geography affect air quality?
Abidjan is built across a network of lagoons — primarily the Ébrié Lagoon — creating a peninsula-and-island urban geography that severely limits natural airflow through the city. Unlike coastal cities with open ocean frontage, Abidjan's lagoon system creates topographic 'bowls' where vehicle emissions and industrial pollution accumulate. The Plateau business district and Adjamé market area sit in particularly low-circulation zones. During calm wind conditions in the dry season, pollutant concentrations can be 40–60% higher than lagoon-facing waterfront areas.
What is the Harmattan and when does it affect Abidjan?
The Harmattan is a dry, dusty northeasterly trade wind from the Sahara Desert that affects West Africa from November to March. It carries fine Saharan mineral dust (predominantly quartz and clay minerals) thousands of kilometers to the coast. In Abidjan, peak Harmattan influence arrives December–February, when PM10 levels can triple compared to rainy season readings and visibility drops sharply. Harmattan dust is primarily PM10 rather than PM2.5, so its health impact, while real, is different from the combustion-derived PM2.5 that defines city pollution in South/Southeast Asia.
What is the Vridi Canal industrial zone and why does it matter for air quality?
The Vridi Canal connects the Atlantic Ocean to the Ébrié Lagoon and serves as Abidjan's industrial port corridor. The Zone Industrielle de Vridi houses thermal power plants, petroleum storage, a refinery (SIR), ship repair yards, and chemical industries. This cluster is Abidjan's primary industrial emission source, contributing an estimated 15–22% of PM2.5 and the majority of SO₂ emissions. Prevailing winds from the southwest occasionally push Vridi emissions into residential areas of Treichville, Marcory, and Port-Bouët district.
Is air quality improving in Abidjan?
Slowly. Côte d'Ivoire has invested heavily in public transport (the Abidjan Urban Transport project, the 37km Autonomous District bus network) and is expanding the Abidjan Metro (first line under construction, Anyama to Port-Bouët). Vehicle fleet standards remain low — the majority of the 5M+ registered vehicles are imported second-hand with no emissions testing at point of use. The Agence Nationale de l'Environnement (ANDE) has deployed air quality monitoring stations since 2019, which is enabling better data-driven policy. Air quality trend data is mixed but suggests slight improvement in industrial emissions with worse transport emissions.