For several days the sky was a full of dust from china. It’s very common phenomenon this time every year. However, this year a mount of dust increased and lasted for long time than we expected. The Korean Meteorological Administration reported that the more global warming, the longer dust will last. usually, dust comes from the main land of china and desert in Mongolia. This dust includes heavy metals and toxic materials. So, it is very harmful to our health,especially to the respiratory organs. People must wear a mask to cover their nose and mouth and wash hands as frequently as possible during that season. We can’t stop this natural phenomenon but can do something not to get worse. One thing we can do is to make efforts not to accelerate global warming.