PM2.5 are extremely small particles. The WHO estimates that every year PM2.5 is responsible for 2.4 million premature deaths worldwide. What is the cause? According to a study conducted by Kyoto University, PM2.5, which enters the body through the respiratory organs, can damage cells and cause inflammation, worsening various diseases. It has also been linked to COVID-19. How do we deal with this invisible threat? In this program, we'll examine countermeasures and look at the latest research on prediction using space technology.