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

  • Home
  • Insights
  • About
  • Contact

Explore Data

  • Interactive Map
  • Trends
  • Cities
  • Health

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
Beta 1.0

CLeNE is currently in beta. Your feedback helps us improve city-level NO₂ exposure intelligence.

Submit Feedback
CLeNE City-Level NO2 Exposure Intelligence
HomeInsights
About
Contact
Cities at Risk

Urban NO₂ Exposure Hotspots

Population-weighted exposure across 27 West African cities - 2019-2025

Cities Analysed27West Africa urban centres
High/Very High Risk1of 27 cities shown
Top Hotspot CityLagos100/100 · Very High
Urban Pop At High Risk224.7M61.5% of urban pop

City Exposure Rankings

Annual Mean - 2019-2025

#City ↑CountryNPWEI ↑RiskPop (M) ↑DJFJJA
1Nigeria
100
Very High15.85M100100
2Nigeria
49
Moderate5.53M5545
3Nigeria
44
Moderate7.24M4447
4Côte d'Ivoire
42
Moderate5.91M3257
5Mali
39
Low5.47M2250
6Nigeria
35
Low13.19M3340
7Nigeria
35
Low9.61M3440
8Nigeria
34
Low10.75M3935
9Nigeria
32
Low11.34M1468
10Nigeria
31
Low7.61M3933
11Senegal
30
Low3.58M1866
12Nigeria
28
Low3.43M3624
13Nigeria
23
Low2.96M1933
14Burkina Faso
22
Low5.10M642
15Nigeria
22
Low4.75M2923
16Ghana
20
Low5.44M2621
17Nigeria
20
Low3.87M2424
18Nigeria
20
Low3.55M2322
19Nigeria
20
Low1.48M160
20Ghana
19
Minimal5.76M2421
21Nigeria
19
Minimal4.50M840
22Nigeria
17
Minimal3.29M052
23Benin
15
Minimal4.28M1918
24Togo
13
Minimal3.89M2113
25Nigeria
10
Minimal3.25M622
26Ghana
1
Minimal1.73M53
27Côte d'Ivoire
0
Minimal1.20M100
Click any row for city details · NASA Gridded Population 2020 · ≥50 ppl/km²

Dakar

Senegal · 14.69°N, -17.45°E

Low
30/100 NPWEI

Seasonal Comparison

Dry (DJF)18/100 NPWEI
Wet (JJA)66/100 NPWEI

JJA is 48 pts higher than DJF

Exposure Profile

Annual
30
DJF
18
JJA
66

City Statistics

Urban Population
3.58M
Coordinates
14.69°, -17.45°
Country
Senegal
PWE
1.65 ×10¹⁵ molecules cm⁻²

Risk Interpretation

Low but manageable.

Dakar is in the low regional exposure tier and below the highest exposure groups.

Top 15 Cities - NPWEI Ranking

Ranked by exposure · 0–100

Annual Mean

Dry vs Wet Season

DJF (orange) vs JJA (green)

DJF vs JJA · Top 10