Scent Programs, Wellness Certification, and Indoor Air Quality: What Property Teams Need to Know

Indoor air quality has moved from a compliance checkbox to a competitive differentiator in commercial real estate. Certification systems like LEED and the WELL Building Standard are real, established frameworks that a growing number of owners and tenants reference when evaluating a building, and indoor air quality and occupant experience are increasingly part of how those certifications — and tenant expectations more broadly — get evaluated. For property teams running or considering a fragrance program, this raises a fair question: does scenting a building support that direction, or work against it.

Understand what these certifications actually evaluate

LEED and WELL are both real, widely recognized certification systems, but they focus on different things and it's worth not conflating them. LEED evaluates a building's overall sustainability performance — energy, water, materials, and indoor environmental quality among other categories. WELL is focused specifically on human health and wellness in the built environment, with air quality, light, and occupant comfort as central themes. Neither system is primarily "about" scent one way or the other, but both increasingly weigh indoor air quality and occupant experience as part of a broader evaluation, which means a property's approach to ambient air — ventilation, filtration, and yes, fragrance — is more visible to sophisticated tenants and evaluators than it used to be.

Property teams should treat specific certification requirements as something to verify directly with the certifying body or a qualified consultant rather than assuming based on general industry conversation — requirements are detailed, are administered by the certifying organizations themselves, and can be specific enough that general guidance risks being wrong in the details that matter for an actual certification submission.

Fragrance and air quality are not the same conversation, but they intersect

A common misconception is that any added fragrance is inherently at odds with good indoor air quality. In practice, the two are separate questions that intersect at specific points. Air quality is primarily about ventilation rates, filtration, humidity control, and minimizing harmful particulates and VOCs. A fragrance program operates on top of that baseline — it does not substitute for good ventilation and filtration, and it should never be used to mask an underlying air quality problem such as poor ventilation, mold, or inadequate filtration. Using fragrance to cover an air quality issue rather than fixing the issue is the scenario that gives ambient scent programs a bad reputation, and it is worth naming directly so property teams avoid it.

Used appropriately — as a deliberate, well-tuned addition to a building with sound underlying air quality — fragrance is a separate layer addressing occupant experience and brand perception, not a fix for a mechanical or filtration deficiency.

What property teams evaluating certification should actually do

• Verify current air quality fundamentals first. Ventilation rates, filtration performance, and humidity control should be sound and documented before layering in any fragrance program.
• Choose fragrance delivery methods thoughtfully. HVAC-integrated diffusion should be calibrated to avoid oversaturating the air, and equipment should be maintained on a schedule that prevents buildup or malfunction.
• Disclose fragrance use where appropriate. Buildings with meaningful populations of fragrance-sensitive occupants — common in healthcare-adjacent or wellness-focused tenancies — benefit from clear signage or disclosure, and from choosing lighter, cleaner fragrance families.
• Consult certification bodies directly on specifics. If pursuing or maintaining WELL or LEED certification, confirm any scent-related requirements or considerations with the certifying organization or a qualified consultant rather than relying on general assumptions.

Positioning scent as part of the wellness story, not a contradiction to it

Tenants increasingly evaluate a building's overall environmental experience, not just its finishes. A thoughtfully selected, well-maintained fragrance program — paired with genuinely sound ventilation and filtration — can be part of how a building communicates that it takes occupant experience seriously, provided the fragrance program is never asked to do the job that good air quality fundamentals are responsible for. The buildings that get this wrong are the ones using scent as a substitute for maintenance; the ones that get it right treat scent as one more deliberate, well-tuned layer in a building that already takes air quality seriously.

This piece is part of our work in commercial property scenting. Related reading: Building a Portfolio-Wide Scent Standard: A Playbook for Multi-Site Property Teams.