The right scent intensity is one people notice when they walk in and stop noticing a few minutes later. If guests comment on how strong it is, or staff start propping doors open, it is too much. In a commercial space, too much scent is worse than none: it turns a quiet brand signal into a complaint.
Getting it right isn’t a matter of turning a dial until it smells nice to whoever is standing next to the machine. It depends on the space, the air, the people and the fragrance itself.
Why too much scent backfires
- It irritates the people who spend all day there. Front-of-house staff live with the scent for a full shift. What feels pleasant for thirty seconds can feel oppressive by mid-afternoon, and some people are sensitive to strong fragrance.
- It reads as covering something up. A heavily scented washroom or lobby invites the question of what the scent is hiding.
- It flattens the fragrance. At high concentration the subtler parts of a composition disappear and the scent reads as one loud note, so a carefully designed brand scent ends up smelling generic.
- It wastes oil. Overscenting simply burns through refills faster.
Why people stop noticing a scent
Our sense of smell adapts. After a few minutes in the same scented space, the brain turns the signal down so it can notice new smells. This is called olfactory adaptation, and it is why the person setting the level is usually the worst judge of it. They have been standing next to the diffuser for ten minutes and have stopped smelling it, so they turn it up. The next person through the door gets the full dose.
What decides the right level
Volume and ceiling height
A double-height hotel atrium needs a very different output from a 40 square metre boutique. Floor area alone is misleading; the volume of air is what matters.
Airflow and ACMV
How often the air in a space is replaced, where supply and return grilles sit, and whether the scent is delivered through the air-conditioning all change how the fragrance spreads. In Singapore most commercial spaces run their ACMV throughout opening hours, which carries scent well but also removes it quickly. Our article on scenting large spaces covers this.
Heat, humidity and doors
Warm air carries fragrance differently from cold air. Entrances where Singapore’s outdoor heat and humidity meet a chilled interior behave differently from the middle of the floor, and busy doors dilute the scent every time they open.
Occupancy and time of day
A lobby at check-out peak and the same lobby at 3am are different spaces. Good systems run on a schedule, so output follows how the space is used.
The fragrance itself
Some fragrances project more than others. Fresh citrus and green notes tend to feel light; woods, ambers and gourmand notes can feel heavy in a small room. A professionally composed fragrance is designed to perform at a controlled level in diffusion, which is part of why we don’t use off-the-shelf oils.
How we set intensity
- Start low. We commission at a conservative setting and increase in small steps.
- Use fresh noses. Levels are checked by people arriving from outside the space, not by whoever has been standing in it.
- Check at different times. Peak and quiet periods, morning and evening, with and without doors in constant use.
- Zone it. Entrances can carry a stronger welcome; reception desks, meeting rooms, food areas and treatment rooms usually need less or none.
- Listen to staff. They are the best early warning. We agree a simple process for raising concerns before the system goes live.
This is the practical difference between owning a diffuser and running a scent programme. Our commercial scent marketing service includes calibration and ongoing adjustment, and our guide to nebulizing diffusers explains the equipment side.
Frequently asked questions
How strong should a business scent be?
Noticeable on arrival, unnoticed after a few minutes. If people comment on the strength, it is too high.
Why can’t I smell the scent in my own shop any more?
That is olfactory adaptation. Your nose has adjusted, not the diffuser. Ask someone arriving from outside before turning the level up.
Should every area be scented at the same level?
No. Entrances and lobbies can take more; desks where staff sit all day, meeting rooms, food preparation areas and clinical rooms usually need less or none at all.
Does Singapore’s humidity affect scent intensity?
It affects how scent behaves, particularly at entrances where warm, humid outdoor air meets air-conditioned interiors. Settings that work in the middle of a space may need adjusting near the doors.
Is strong fragrance a health risk?
Fragrance formulated within the IFRA Standards and diffused at a sensible level is widely used in commercial spaces. Some people are sensitive to strong scents, which is one more reason to keep levels moderate and to have a way for staff and visitors to raise concerns.
Further reading: Olfaction on Wikipedia.
