Yes, a persistent sewer smell inside a home is potentially harmful to both health and safety. Continuous exposure to sewer gas vapors—which contain hydrogen sulfide and methane—can lead to chronic respiratory irritation, severe headaches, nausea, dizziness, and fatigue. Additionally, if the sulfur odor originates from a significant natural gas leak or a massive accumulation of explosive methane gas in a confined basement or crawlspace, it presents a catastrophic fire hazard. Verification: Ventilate the affected space immediately and hire a licensed professional plumber or gas specialist to inspect your home.
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