Why do people sneeze before the weather clears up?

Because people's noses are always wet, that's how we smell. When the weather is dry, our noses are dry. In order to replenish the moisture on the nose, we sneeze to solve the problem. So some people say it will be sunny when sneezing. Although these are common sayings, they still have certain scientific basis. This is because when the weather is clear, the humidity in the air will be relatively reduced, and the weight of dust will be reduced, so it will float in the air. When you look up, dust can easily enter your nose, which leads to the feeling of sneezing. At present, it is believed that the perception of eyes and nose is dominated by the same trigeminal nerve, so the defensive response to strong stimuli is chaotic and causes sneezing. Specifically, it is the strong sunlight entering from the eyes, and the nasal cavity mistakenly thinks that it stimulates itself, so it wants to discharge foreign bodies in the form of sneezing.