Fuel-gas odorant smell

Distinct sulfur-like odor deliberately added to otherwise odorless fuel gas.

First distinction

Note where the odor is strongest, whether it appears with rain, wind, heating, plumbing or ventilation, and whether closing a door changes it.

Do not mask the pattern

Fragrance can make the pathway harder to identify. Record timing before cleaning or moving stored material.

Next useful step

Treat this as a safety signal. Stop normal investigation and follow the applicable emergency or professional guidance.