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Title: Odorization
Author: Maurice E. Calaway
Source: 1976 International School of Hydrocarbon Measurement
Year Published: 1976
Abstract: On March 18, 1937 a gas explosion demolished the New London, Texas school building causing the death of 294 persons - 280 pupils and 14 teachers. The natural gas delivered to the building came from a free unodorized gas connection. Within a few months after the explosion the State of Texas had an odorization law. Gradually other states passed odorization regulations. The state odorization laws generally required that when gas is present in an enclosed room, it can be smelled when the concentrated gas is 1% to air, or is 1/5 of the lower explosive limit.

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