The addition of which substance as an odorant was mandated following the 1937 explosion in New London, TX?

The addition of mercaptan as an odorant was mandated following the tragic 1937 explosion in New London, Texas, to enhance the safety of natural gas. Natural gas is odorless in its pure state, making it difficult for individuals to detect leaks, which can lead to catastrophic events such as explosions. Mercaptan has a very distinct and strong odor, often compared to that of rotten eggs, which makes it easy for people to notice the presence of gas even in small concentrations. This safety measure is crucial for protecting lives and preventing accidents related to gas leaks, ensuring that the public can respond quickly to identify and rectify the dangers associated with gas escapes. The mandate for using mercaptan is a direct response to the increased awareness and need for safety practices in the handling of combustible gases.