Urban Mobility and Air Quality: A Correlational Analysis of Associations Across 48 Cities in Developing Economies

This study investigates the relationship between urban mobility and air quality across 48 major cities in developing countries, categorized by national income level.Data on urban mobility metrics and fine particulate matter (PM2.5)pollution indices were sourced from the Urban Global Indicator Report 2024 and complementary World Bank and WHO repositories.City selection was based on population size, data availability, and regional representation to ensure a robust sample.Employing a quantitative, cross-city comparative approach, the analysis revealed significant variations in the strength of the correlation between mobility patterns and air quality across different income groups.A moderate negative correlation (Pearson's r = -0.45)was observed in low-income countries, strengthening in lower-middle-income nations (r = -0.52)and subsequently weakening in upper-middle-income contexts (r = -0.39).Multiple regression analyses further indicated that urban mobility factors accounted for approximately 25% to 40% of the observed variance in air pollution levels across these distinct groups.The findings underscore that the leverage of mobility policies on air quality is highly contextdependent, mediated by factors such as vehicle fleet composition, fuel standards, and the state of transport infrastructure.Consequently, the study concludes that policymakers must prioritize tailored, income-stratified strategies rather than one-size-fits-all solutions.Specifically, low-income cities require foundational investments in accessible and reliable public transit to curb rapid motorization.Lowermiddle-income cities, where the mobility-air quality link is strongest, benefit most from integrated transport systems and traffic management technologies.For upper-middle-income cities, the analysis suggests that improving mobility alone is insufficient; these cities must supplement transport reforms with complementary policies that target industrial emissions and enforce advanced vehicular emissions standards.This nuanced understanding is critical for designing effective, sustainable urban development policies in the Global South.