Welcome to Day 10 of our #30DayMapChallenge series!
Today’s theme, Air, focuses on the invisible layer that sustains life but often silently endangers it — the atmosphere.

Today’s theme: Air

AT A GLANCE:

  • Focus: PM2.5 and atmospheric pollution patterns across Nigeria
  • Data Source: Open-Meteo API (atmospheric & pollutant concentrations)
  • Tools: Python, GIS, environmental analytics, and data visualization

Reading time: 2 minutes | Map Challenge Day: 10 of 30 | Theme: Air

Nigeria’s Atmospheric Landscape

Air is invisible — but its impact is undeniable.
Today’s visualization examines how PM2.5 (fine particulate matter) varies across Nigeria, revealing a striking divide:

  • Coastal states like Lagos, Ogun, and Rivers benefit from stronger oceanic airflow, which helps disperse pollutants and maintain lower PM2.5 concentrations.
  • Inland cities such as Kaduna, Kano, and parts of Abuja experience significantly higher pollution levels due to industrial activity, population density, and weaker wind circulation.

These regional contrasts aren’t just scientific observations — they translate to real health outcomes. According to the World Bank (2023), nearly 70% of environment-related premature deaths in Nigeria are linked to air pollution. And IQAir’s 2024 Air Quality Report places Kano and Onitsha among Africa’s most polluted cities, often exceeding WHO guidelines tenfold.

Why PM2.5 Matters

PM2.5 particles — smaller than 2.5 micrometers — penetrate deeply into the lungs and bloodstream.
Long-term exposure increases risks of:

  • Respiratory diseases
  • Cardiovascular complications
  • Developmental disorders
  • Premature death

(WHO, 2022)

Understanding this distribution is crucial for sustainable planning, environmental health, and policymaking.

Data Source: Open-Meteo API – Atmospheric & Pollutant Concentrations (2025)
Methodology: Spatial interpolation of PM2.5 readings combined with environmental flow modeling

The Map: Visualizing Air You Cannot See

Our map for Day 10 uses interpolated PM2.5 concentrations to illustrate where Nigeria’s atmosphere is cleanest — and where it poses the greatest risks.

How to Explore This Map

  • Zoom in to identify local PM2.5 variations across states and cities
  • Compare coastal and inland regions using the color gradient
  • Click on any location (if interactive layers enabled) for pollutant metrics
  • Use fullscreen mode for clearer visibility of atmospheric patterns

Tip: Higher values indicate higher health risk — especially during dry, dusty seasons.

Understanding the Atmospheric Patterns

What This Map Shows

  • PM2.5 Intensity: Levels of fine particulate matter across Nigeria
  • Coastal Dispersion: Cleaner air due to stronger oceanic airflow
  • Northern Hotspots: Higher pollution linked to harmattan, industry, and population growth
  • Urban Pressure: Major cities showing sustained elevated PM2.5 levels

Why This Matters

Air quality affects every aspect of urban life — health, productivity, mobility, and sustainability.
By mapping PM2.5, we help planners and decision-makers design:

  • Cleaner transport systems
  • Greener urban infrastructure
  • Health-conscious zoning policies
  • Climate-resilient cities

Air, Cities, and Planning

Understanding air quality is more than a scientific exercise — it informs:

  • Traffic flow optimization to reduce congestion-related emissions
  • Placement of green belts and urban forest networks
  • Environmental zoning for industrial expansion
  • Public health interventions in high-risk neighborhoods

Integrating atmospheric analytics into planning helps create cities where clean air is a right, not a privilege.

Mapping for Change

At Nexus Engineering and Planning, our goal is to turn environmental data into actionable insights for healthier Nigerian cities.
Day 10 underscores the importance of monitoring what we cannot see — and planning for the air we breathe.

About the #30DayMapChallenge

The #30DayMapChallenge invites creators worldwide to explore geography and cartography through themed daily visualizations.

Today is Day 10: Air
A reminder that even invisible elements have spatial stories to tell.

Tomorrow: Day 11 — Minimal Maps
We challenge ourselves to use as few cartographic elements as possible while keeping the map clear and insightful.

References

World Bank (2023). The Cost of Air Pollution in Africa: Economic and Health Impacts of Fine Particulate Matter (PM2.5). Washington, D.C.

World Health Organization (2022). Global Air Quality Guidelines: PM2.5, PM10, Ozone, NO₂, SO₂, CO. Geneva: WHO.

IQAir (2024). World Air Quality Report 2024. Retrieved from IQAir.

Want to explore Nigeria’s environmental data? Contact us

Follow the entire #30DayMapChallenge series: Nexus Insights