For my adult life, smoke detectors have been the “safety norm” in homes and residential occupancies such as hotels, motels, dormitories, etc. Even now, we are moving towards these structures having CO detectors. In fact, many brands make a CO/Smoke Detector as one unit. With the rise in home explosions from natural gas leaks, I wonder why there is no substantial movement to equip homes with NG supply with an LEL detector and alarm and maybe a safety system that shuts off the supply when NG is detected. NG has an odorant, but it only works when a human is present to smell it and respond appropriately BEFORE the LEL is achieved. With today’s technology, we could have an LEL detector tied into an emergency shutoff valve outside the home so that the feed valve closes before the LEL is achieved. It may be a technological limitation based on the calibration frequency of the detectors. I was thinking outside the box in hopes that we can reduce these tragic explosions in people’s homes.