Why natural gas smell when use indoor?

or:Why natural gas smell when use indoor?or:Natural gas does not smell normally, but as a safety precaution an easily identifiable smell is added to

or:Why natural gas smell when use indoor?

or:Natural gas does not smell normally, but as a safety precaution an easily identifiable smell is added to it so that people can be warned that there is a leak.

or:some times they add a smell to it so u can tell if u have a leak and it is in a confined inside so it is a smaller area to disapate

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