Gas leak near appliance — Rotterdam, Zuid-Holland

SAFETY FIRST: if you smell the distinctive rotten-egg odor of natural gas (mercaptan) near a stove, furnace, water heater, or gas line, evacuate everyone from the building immediately. Do not flip light switches, use phones indoors, or start vehicles in the garage — any spark can ignite the gas. Once outside, call your gas utility's emergency line, then 911 if the odor is strong. A gas leak is typically caused by a loose or corroded fitting, a cracked flexible connector (appliance line), a failed gas valve, or a pilot light that blew out and is releasing unburned gas. After the utility confirms the area is safe, a licensed plumber or gas-line technician pressure-tests the supply lines, tightens or replaces fittings, and checks every appliance connection. Even a small leak that you barely smell can accumulate in enclosed spaces to explosive levels, so never ignore the odor or attempt DIY repair.