Safety first:Suspect natural gas, smoke, fire or an active CO alarm? Leave the area and follow local emergency guidance before troubleshooting. Gas / rotten eggsSmoke / burning
Odor family

Gas & Fuel Smells

Fuel-related odors can be hazardous. If natural gas is plausible, leave the area first. Gasoline vapor and vehicle exhaust have different sources, and carbon monoxide itself has no smell.