Given a proper fermentation, no further gas production should occur. Never enter a silo without someone on the outside monitoring your activity. For information about grain storage, see MU publication G01969, Safe Storage and Handling of Grain. Some types of dust are more dangerous than others. But all dust can cause serious health problems to an individual, depending on the amount, type and length of exposure.
Some dust carries antigens that cause severe irritation to the respiratory tract and lungs.
This often results in lung damage. It results from breathing moldy forage or grain, normally hay. Farmer's lung is one of the most disabling diseases among dairy farmers. Farmer's lung symptoms often are not noticed until several hours after exposure to the dust. Symptoms often are mistaken for bronchitis or pneumonia.