Haze pollution and urban sprawl: An empirical analysis based on panel simultaneous equation model

Area of Science:

• Environmental Science
• Urban Studies
• Economics

Background:

• Haze pollution, particularly from PM2.5, is a significant environmental challenge in China.
• Urban sprawl is a complex phenomenon with potential environmental consequences.
• Understanding the interplay between pollution and urban development is crucial for sustainable cities.

Purpose of the Study:

• To investigate the bidirectional causal relationship between haze pollution and urban sprawl in Chinese cities.
• To analyze the heterogeneity of this relationship across different regions and city sizes.
• To provide evidence-based recommendations for urban governance and environmental management.

Main Methods:

• Utilized panel data for 227 Chinese cities from 2002 to 2018.
• Employed a panel linkage equation model to assess causality.
• Incorporated an air flow coefficient instrumental variable to strengthen findings.
• Conducted heterogeneity analysis based on geographical regions and city sizes.

Main Results:

• Confirmed a bidirectional positive causal relationship between haze pollution (PM2.5) and urban sprawl.
• Haze pollution positively influences urban sprawl, and urban sprawl exacerbates haze pollution.
• Regional analysis revealed significant negative impacts in the East, no significant impact in the West, and positive impacts in the Central and Northeast regions.
• Analysis by city size indicated a bidirectional positive relationship across large, medium, and small cities, with varying degrees of influence.

Conclusions:

• Haze pollution and urban sprawl are intertwined, creating a feedback loop in Chinese cities.
• Effective urban governance requires localized strategies, technological innovation for energy reduction, and big data utilization.
• Addressing haze pollution and managing urban sprawl necessitates integrated policy approaches tailored to regional and city-specific contexts.