CLeNE is currently in beta. Your feedback helps us improve city-level NO₂ exposure intelligence.
Submit FeedbackAn open-access satellite-derived dashboard tracking population-weighted NO₂ exposure across West African urban centres from 2019-2025. Built by the AtmosTech Lab at KNUST, Kumasi, Ghana.
PWE = Σ(population × NO₂) / Σ(population)Urban pixels ≥50 people/km² only. Normalised 0-100:NPWEI = (PWE - min)/(max - min) × 100Monthly TROPOMI NO2 L3 files downloaded Jan 2019-Dec 2025. NASA Gridded Population 2020 at 0.1 degree clipped to West Africa.
Only pixels >=50 people/km2 are included. Latitude-varying cell area is computed to support consistent urban masking.
NO2 is interpolated onto the population grid. Seasonal means are computed for DJF, JJA, Annual per city and country.
Raw PWE is normalised 0-100 and exported as JSON plus vector tiles for MapLibre.
| Dataset | Source | Resolution | Period | Use |
|---|---|---|---|---|
| TROPOMI NO2 L3 | ESA Sentinel-5P / NASA GES DISC | 0.01 degree | Jan 2019-Dec 2025 | NO2 column |
| NASA Gridded Population | NASA / Univ. of Southampton | 0.1 degree | 2020 baseline | Urban weighting |
| Country Boundaries | Natural Earth / geo-countries | Vector | Current | Masking & display |
| Fire Radiative Power | NASA FIRMS VIIRS | 375 m | 2019-2025 | Fire driver data |
Help us improve this platform. Your comments are valuable to the research team at AtmosTech Lab, KNUST.