A mixture of air and gas is considered hazardous when it exceeds what percentage of the lower explosive limit?

A mixture of air and gas is considered hazardous when it exceeds 10% of the lower explosive limit (LEL). The lower explosive limit is the lowest concentration of a gas or vapor in the air that can ignite and cause an explosion. When the concentration of a flammable gas in the air reaches or exceeds 10% of this limit, the risk of ignition and an explosion significantly increases.

Understanding the concept of the lower explosive limit is critical for assessing safety in environments where flammable gases are present. Additionally, monitoring levels below 10% LEL can help ensure worker safety and prevent dangerous situations, making proper understanding and adherence to these limits essential in safety protocols in facilities that use or store flammable gases.