If you notice any irregularity with the gas
Using the gas improperly is very dangerous.
If you notice any irregularities, switch off the gas, open the windows and do not light any flames (or sparks) in the house.
Propane gas is heavier than air, so it is necessary to sweep it out.
If you notice any irregularities, contact your local gas company, regardless of the time of day or holidays.
If you use propane gas, contact details are written on the gas cylinder.


Note 1 　For details, ask a person who understands Japanese to enquire for you at a gas company near you.

This information is from the CLAIR website. The Council of Local Authorities for International Relations (CLAIR) was established in July 1988 in response to rising concerns about local level internationalization in Japan.