Author contributions
EJL, JSK, DHK, MHL contributed to the study design, protocol and study materials. HSS, JSK, SWY collected study data. HSS, SWY, SHK, SJN designed the statistical plan and data analysis. HSS, SWY performed the statistical analysis. EJL, MGK, JSK, HSS, wrote the first draft of the manuscript. All authors contributed to interpretation of the data and revision of the manuscript.
Running title : Effect of outdoor air pollutants on the risk of COPD exacerbations
Keywords : Chronic Obstructive Pulmonary Disease exacerbation, air pollutant, environmental factors
Sources of funding : None
Text word count: 2602 words
Number of tables and/or figures: 4/3