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What to do if…
you smell a strong chemical or solvent odour indoors and you can’t identify the source

Short answer

Get everyone (and pets) into fresh air immediately. If the odor is strong, spreading, or anyone feels sick, call 911.

Do not do these things

  • Do not search the home breathing it in to “track it down.”
  • Do not flip electrical switches, use garage door openers, or turn appliances on/off if there’s any chance it could be flammable gas/fuel/solvent vapors.
  • Do not light anything (candles, cigarettes) or use a flame.
  • Do not mix cleaners or spray more chemicals to cover the smell.
  • Do not re-enter if you feel lightheaded, nauseated, have chest tightness, wheeze, confusion, or eye/throat burning.

What to do now

  1. Move to fresh air first. Get everyone outside or to an open-air area. Assist children, older adults, and anyone with asthma/COPD first.
  2. As you leave (without lingering), open a door or window to vent. Don’t stay inside “airing it out.”
  3. If anyone has serious symptoms (trouble breathing, chest pain/tightness, fainting, confusion, seizures, repeated vomiting, chemical burns/eye injury): call 911 and say you suspect chemical fumes indoors.
  4. Call Poison Control for exposure guidance once you’re in fresh air: 1-800-222-1222. Follow their instructions (they may advise urgent care/ER evaluation).
  5. If the odor might be natural gas, propane, gasoline, or other flammable vapors: stay out, keep others away, and call 911 if it feels urgent/strong/spreading. If it does not feel immediately life-threatening and you already have your gas utility’s emergency number, you can call it from outside.
  6. If you may have chemical on you (liquid, mist, residue): remove contaminated outer clothing if practical, place it in a bag, and rinse exposed skin with lots of lukewarm water. If eyes sting, rinse with clean water. Then call Poison Control for next steps (or 911 if symptoms are severe).
  7. If you’re in an apartment/shared building: after you’re safe, call 911 if the odor is strong/spreading or in halls/utility areas. Tell them it may affect multiple units. Alert neighbors by knocking (avoid switches/buzzers if you suspect flammable vapors).
  8. From outside, write down the basics: time it started, where it seemed strongest, any recent painting/renovation, fuel storage, pest control, or cleaning products used—this helps responders and Poison Control.

What can wait

  • You do not need to identify the exact chemical right now.
  • You do not need to clean, deodorize, or “neutralize” the odor.
  • You do not need to decide today who is responsible (landlord/neighbor/contractor). Focus first on safety and medical advice if anyone feels unwell.

Important reassurance

A sudden unexplained chemical smell can trigger panic and real physical symptoms. Leaving first and treating it as potentially hazardous is a reasonable protective step—even if it turns out to be a temporary or low-risk source.

Scope note

These are first steps to reduce immediate harm. Follow-on steps (maintenance/repairs, landlord reports, environmental health involvement, or testing) come after the immediate risk is controlled.

Important note

This is general first-step safety information, not medical or professional advice. If you think there is immediate danger, call 911. For exposure guidance, you can also call Poison Control (1-800-222-1222).

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