Does urban sprawl exacerbate urban haze pollution?

Area of Science:

• Environmental Science
• Urban Studies
• Economics

Background:

• Rapid urban sprawl is a global phenomenon, often linked to economic development.
• Its precise impact on environmental pollution, specifically haze pollution, requires detailed investigation.

Purpose of the Study:

• To investigate the nonlinear relationship between urban sprawl and haze pollution in China.
• To analyze the temporal and regional variations in this impact.

Main Methods:

• Utilized panel data from 30 Chinese provinces spanning 2002-2018.
• Employed a spatial lag model to assess urban sprawl's effect on haze pollution.
• Measured urban sprawl using urban built-up area (ba) and urban public facilities occupation (upfo).

Main Results:

• An inverted U-shaped relationship exists between built-up area expansion and haze pollution.
• A U-shaped correlation was found between urban public facility occupation and haze pollution.
• The impact of urban sprawl on haze pollution became significant between 2011-2018, compared to 2002-2010.
• Haze pollution effects from urban sprawl are more pronounced in eastern and western China than in central regions.

Conclusions:

• Urban sprawl's impact on haze pollution is complex and nonlinear, varying with the type of sprawl.
• The relationship has strengthened over time and differs significantly across Chinese regions.
• Policy interventions should consider these nuanced dynamics for effective environmental management.