CLeNECity-Level NO₂ Exposure Intelligence

Satellite-derived exposure intelligence for West African cities, built to support research, policy, and public-health decision making.

Beta 1.02019-202527 cities

Platform

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Data Basis

Sentinel-5P TROPOMI NO₂ columns, NASA Gridded Population 2020, and supporting boundary layers.

NO₂ columns are not direct surface concentrations, clinical outcomes, or regulatory certification.

atmostechlab@knust.edu.gh

Copyright 2026 AtmosTech Lab, KNUST. All rights reserved.

West AfricaKNUST
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CLeNE City-Level NO2 Exposure Intelligence
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Platform insights

West Africa NO₂ Exposure at a Glance

Key metrics and trends - Sentinel-5P TROPOMI - 2019-2025 - 27 cities across 15 countries

Explore Map
West Africa Avg NPWEI40/100 - Annual Mean
Highest Exposure CityLagos100/100 NPWEI
Pop at High Risk224.7MNPWEI >= 60

Yearly NPWEI Trend

2019-2025

Annual - DJF - JJA - West Africa average

Country Rankings

Annual NPWEI

Top countries by exposure score

Top 10 City Hotspots

Annual Mean NPWEI

Cities ranked by population-weighted NO2 exposure score

Population by Risk Tier

Urban Pop (M)

People in each NPWEI exposure tier

Dry Season Dominance

Harmattan winds (DJF) suppress vertical mixing and concentrate NO2 near the surface, driving NPWEI significantly higher than the wet season across all cities.

Urban Industrial Hotspots

Major port and industrial cities consistently record Very High NPWEI tiers, driven by dense traffic, port emissions, and industrial activity.

Satellite-Powered Evidence

TROPOMI L3 NO2 columns at 0.01 degree resolution, population-weighted using NASA Gridded 2020 data restricted to urban pixels >=50 ppl/km2.