1.1 Background and Rationale 1.2 Research Objectives 1.3 Scope and Significance 1.4 Research Questions 1.5 Methodology Overview 1.6 Organization of the Thesis

Chapter 2

2.1 Evolution of Urban Greenery and its Role in Air Quality Improvement 2.2 Key Components and Mechanisms Through Which Urban Greenery Influences Air Quality 2.3 Effects on Particulate Matter, Gaseous Pollutants, and Overall Air Quality Index 2.4 Previous Studies on the Relationship Between Urban Greenery and Air Quality 2.5 Gaps in Existing Research 2.6 Conceptual Framework

Chapter 3

3.1 Case Selection and Study Design 3.1.1 Criteria for Selecting Cities with Varied Levels of Urban Greenery 3.1.2 Comparative Analysis Framework 3.2 Data Collection 3.2.1 Air Quality Monitoring, Vegetation Analysis, and Green Space Mapping 3.2.2 Surveys and Interviews with Environmental Experts, Residents, and Urban Planners 3.3 Investigating the Relationship Between Urban Greenery and Air Quality 3.4 Modeling Techniques for Predicting Air Quality Improvement with Increased Greenery 3.5 Community Engagement and Stakeholder Perspectives 3.6 Policy Analysis and Regulatory Frameworks 3.7 Limitations and Assumptions

Chapter 4

4.1 Analysis of the Relationship Between Urban Greenery and Air Quality 4.2 Evaluation of Greenery Impact on Particulate Matter, Gaseous Pollutants, and Air Quality Index 4.3 Comparative Analysis of Cities with Different Greenery Levels and Air Quality Outcomes 4.4 Expert Perspectives on the Benefits and Challenges of Enhancing Urban Greenery 4.5 Opportunities and Risks Associated with Promoting Greenery for Air Quality Improvement 4.6 Implications for Urban Planning and Environmental Management Policies

Chapter 5

5.1 Summary of Findings 5.2 Contributions to Existing Knowledge 5.3 Practical Implications for Enhancing Air Quality through Urban Greenery 5.4 Recommendations for Future Research 5.5 Conclusion