Bathroom

Why this carrier here

Relative humidity in a bathroom after a shower sits between 70% and 85% for roughly forty minutes. Water vapour competes with fragrance molecules for the same air, and then the extractor fan removes both. A carrier here needs a higher surface area or a higher loading to hold its line through that cycle.

The 5.6 m2 footprint is small enough that a single carrier can genuinely fill the room, so the temptation is to overshoot. In practice the correct rung for a bathroom is one step below what feels right in the shop, because the room is read at close range while damp.

Non-porous surfaces only. Unglazed ceramic, pressed cardboard and bare wood all take on water and go soft or mottled within a season.

Same room, other rung

Rung	Covers	One fill lasts	Rung matrix
L1	Barely there 1–5 m2	1-5 m2 of treated surface or enclosed volume; one sachet, one small plaque, two sprays on a cushion.	in preparation
L2	Close range 3–12 m2	3-12 m2; one 40-60 g wax tablet, one 60-90 g plaque, a four-reed diffuser, or three sprays on upholstery.	A 92 g porous stone in a 5.6 m2 bathroom that runs at 72% humidity
L3	Half the room 10–26 m2	10-26 m2; a six- to eight-reed diffuser, two plaques at opposite ends, or a diffuser plus a stone.	in preparation
L4	Whole room 18–30 m2	18 m2 and up, or any open-plan volume; two eight-reed diffusers, a diffuser plus two stones, or a diffuser plus a textile pass.	in preparation

1 live plan(s)

• A 92 g porous stone in a 5.6 m2 bathroom that runs at 72% humidity (L2 · 38 d · CNY 16)