Fumigation vs. "fumigación"
True structural fumigation is a licensed operation that seals a building and fills it with a gaseous pesticide. In US Spanish, "fumigación" is also used colloquially for any pest treatment.
This ambiguity produces genuinely wrong expectations in both directions — a resident told their apartment will be "fumigated" may expect to be displaced for days when a routine treatment is planned, or may not realise a real fumigation requires vacating the building entirely. We disambiguate this on every Spanish treatment page.