I believe the wording is wrong- Gas is odorless if it is natural:
Natural gas is an efficient, safe, colorless and odorlessgas. For easy detection, we add a harmless chemical called mercaptan to give gas a distinctive odor. Most people describe the smell as rotten eggs or hydrogen sulfide like odor. It smells bad for a good reason - in case of a gas leak!

Natural Gas Odor
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The dispatching in my county says “odor of natural gas”
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natural gas has no odor
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Understood, but the idea of the call is for that intentionally tainted natural gas. Besides, I think St. Louis County Dispatch knows what they’re talking about too!
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Isnt that the same as a gas leak...
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One is confirmed. The other is a suspicion/investigation.
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Gas leak is fuel spill from say a car. Odour of gas is a leak from a gas pipe in a building, maybe connected to a cooker or maybe it’s a ruptured gas main, either way it still smells
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You said it has an odor in your original post. This is the first responder world, not the the chemistry world, and the properties of natural gas are not changed by the addition of Mercaptan. It's just as flammable.
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And this is what happens when a major pressure surge of that Natural Gas occurs.
https://boston.cbslocal.com/2018/09/14/law…sions-gas-main/
Largest response from the region (and beyond) in many years.
John M
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