Silo gas is formed through the natural fermentation process of chopped forages shortly after it is placed in the silo. Every farm worker must understand the dangers associated with silo gases and how to deal with them. Remember that the less silage in the silo the greater the risk that the ventilation from the silo blower will be insufficient to adequately dilute the silo gas. A calibrated multi-gas meter used to test for gases outside the silo can alert you to whether gases are present. Remember it is rare for a silo to begin burning in the first week of filling and if a cloud is seen escaping the silo, it is most likely due to silo gas.