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Related Experiment Video

Updated: May 21, 2025

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How does urban morphology impact cities air quality? A modelling study.

B Augusto1, S Coelho1, S Rafael2

  • 1Department of Environment and Planning & CESAM - Centre for Environmental and Marine Studies, University of Aveiro, Portugal.

The Science of the Total Environment
|March 20, 2025
PubMed
Summary
This summary is machine-generated.

Compact urban design can significantly reduce air pollution, such as nitrogen dioxide (NO2) and particulate matter (PM). Dispersed city planning, however, worsens air quality, increasing health risks from pollutants.

Keywords:
Air quality modellingHealthier citiesLand use changeUrban morphology

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Area of Science:

  • Environmental Science
  • Urban Planning
  • Atmospheric Chemistry

Background:

  • Urbanization leads to significant environmental impacts, including air pollution, affecting human health and ecosystems.
  • Future urban development requires strategies to mitigate air quality issues.
  • Understanding the relationship between urban form and air quality is crucial for sustainable city planning.

Purpose of the Study:

  • To assess how different urban morphologies influence air quality in future multi-core regions.
  • To compare the air quality impacts of urban compaction (Focused City, Independent City) versus urban dispersion (Dispersed City) against the current baseline.
  • To provide insights for urban planners and policymakers on designing healthier urban environments.

Main Methods:

  • Development of three distinct urban morphology scenarios (Focused City, Independent City, Dispersed City) for Aveiro, Portugal.
  • Application of a coupled meteorological and chemical transport model (WRF-CAMx) adapted for urban land use differentiation.
  • Comparison of modelled annual air pollutant concentrations (NO2, PM10, PM2.5) across scenarios and baseline.

Main Results:

  • Compact urban scenarios (Independent City, Focused City) reduced NO2 (-20%, -17%) and particulate matter (PM10: -3%, -2%; PM2.5: -2%, -1%) concentrations.
  • The Dispersed City scenario drastically increased NO2 concentrations (+98%) due to road transport and lack of active mobility policies.
  • Increased NO2 concentrations in the Dispersed City scenario led to higher population exposure, despite dispersion.

Conclusions:

  • Compact urban morphologies are effective in minimizing air pollutant concentrations, contributing to improved urban air quality.
  • Urban planning decisions, particularly the location of industrial areas and promotion of active mobility, significantly impact air quality and public health.
  • The applied methodology and modeling tools offer a transferable framework for assessing and enhancing urban air quality globally.