Objective: This study investigated public behavior regarding the acquisition of particulate matter (PM) information and how it is influenced by the perceived severity of the impact of PM on health in Korea and China. Background: Awareness of the harm caused by PM to health and the economy has recently increased. As PM pollution increases, people may seek related information through various channels to avoid the negative impact of PM. Method: An online survey was conducted in Korea and China. Results: The more severe the perceived impact of PM on health, the more frequently both Korean and Chinese persons sought PM information. For both groups, there were significant correlations between the perceived severity of health impact and diversity of means of information acquisition. Conclusion: In both China and Korea, awareness of PM may be increased via information provided by newspapers, neighbors and acquaintances, social media, government warning messages, and real-time monitoring applications. Application: The results of this study constitute valuable reference material for related academic and industrial research.