Title page
Contents
Executive Summary 3
A Note About Mixing Ratios, Concentrations, and Levels 4
1. Introduction 9
1.1. Study Background 9
1.2. Challenges Associated with Considering Air Pollutant Mixtures 11
1.3. The Urban Air Pollution Mixture in Winter 13
2. SWAPIT Science Activities 15
2.1. Existing Scientific Infrastructure 15
2.2. Overview of the 2024 Intensive Field Measurement Campaign 20
2.3. Science Activities Under Theme 1 - Characterisation 22
2.4. Science Activities Under Theme 2 - Sources and Processes 25
2.4.1. Sources 26
2.4.2. Atmospheric processes 33
2.5. Scientific Activities Under Theme 3 - Impacts 43
2.6. Scientific Activities Under Theme 4 - Science tool evaluation and improvement 50
3. Results: Analysis, Integration, and Communication 59
3.1. Data Acquisition and Management 59
3.2. Data Analysis and Integration 60
3.3. Communication of Results 60
3.4. Applicability to Other Locations 61
Acknowledgements 62
References 63
Appendix A. Authors and Contributors 79
Appendix B. Calendar for Intensive Field Measurement Campaign in Early 2024 82
Appendix C. Summary of SWAPIT Science Activities Under Themes 2, 3 and 4 84
Appendix D. SWAPIT Leadership Team 89
Table 1. Existing air pollution science networks, projects, and platforms relevant to SWAPIT 16
Table 2. Data availability for select urban air pollutants in SWAPIT 24
Figure 1. Over-arching questions to be investigated by SWAPIT 10
Figure 2. Exposure pathways, pollutants, and scientific activities relevant to SWAPIT 11
Figure 3. Fixed ground-based measurement sites proposed for 2024 SWAPIT Field Intensive. The background grid represents the 2.5-km model grid... 20
Figure 4. Ambient air pollutant data-gathering methods under SWAPIT 23