Has a feng shui master come to see what's going on? This is my uncle's grave. He died in a car accident at the age of 43.

Don't associate everything with feng shui. The temperature there should be very low. The heat of firecrackers penetrates below the ground, which is equivalent to heating the shop. Coupled with the low temperature, white fog with large temperature difference between air and ground is normal! I can see this situation in winter and late autumn in Hubei. Nothing!