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Pollution & air quality

Indoor air quality


What do we mean by “scents”?

When we talk about scents, we mean fragrances, aromas or perfumes – anything that adds a smell to something else.

Scents can usually be found in personal care products, such as perfumes, aftershaves, colognes, shampoos and conditioners, soaps, body lotions and deodorants.

Scents are also found in household items, such as air fresheners, deodorizers, candles, some laundry detergents, fabric softeners and cleaning products.

Scents can also be found in the workplace (e.g. cleaning products, adhesives, caulking).

How can scented products affect my health?

Chemicals used to add scents to products can cause serious health problems for some people, especially for people with lung diseases such as asthma or COPD. Being near a scented product can make some people sick.

Scents enter our bodies through our skin and our lungs. The chemicals in scents can cause many different reactions. Even products containing natural plant extracts can cause allergic reactions in some people.

While some people are only mildly affected by scents, others have severe reactions. Some common symptoms include:

  • headaches
  • feeling dizzy
  • feeling tired or weak
  • shortness of breath
  • nausea
  • cold-like symptoms
  • worsening asthma symptoms1
What ingredients are in scents?

Scents are usually made from a mixture of natural and man-made chemicals. A typical fragrance can contain between 100 to 350 ingredients. The problem with scented products is not so much the smell itself as the chemicals that produce the smell.

Scented products can contain several toxic chemicals that constantly turn into vapor in the air and attach themselves to hair, clothing, and surroundings. Most (95%) of the chemicals used are synthetic compounds made from petroleum. These include chemicals made from benzene, aldehydes and many other known toxins and sensitizers2.

One commonly used chemical is diethyl phthalate, which is used to make scents last longer. It can cause allergic skin reactions (contact dermatitis) and is classified as a skin sensitizer and a reproductive toxin, according to HAZ-Map: Occupational Exposure of Hazardous Substances of the National Library of Medicine of the United States.3

Does "unscented" or "fragrance-free" really mean there is no fragrance?

No. Even products labeled "unscented" or “fragrance-free” may actually contain fragrances used to mask the smell of certain ingredients. Health Canada has specific rules about how companies can use these words on their labels. According to Health Canada's labeling regulations, "fragrance free" or "unscented" means that there have been no fragrances added to the cosmetic product, or that a masking agent has been added in order to hide the scents from the other ingredients in the cosmetic.

How to avoid using scents at home
How to avoid scents outside of your home
  • Use scent-free products when available.
  • Keep your workspace or office well ventilated.
  • Keep detergents and soaps in sealed containers or a cupboard with a door that completely closes. Make sure the room they are stored in is well ventilated.
  • Respect the scent-free policies at your work, school, place of worship, gym or recreational centres and any other public areas.
  • Ask if you can post a "Scent-free building" sign (PDF) at your work, school and place of worship
  • If scent-free policies are not in place, work with your (or your child's) school, workplace, place of worship, or gym to adopt a scent-free or scent-reduced policy. For more information on how to create and implement scent-free policies, visit: "Developing a Scent-free Policy for the Workplace".
If you choose to wear perfumes:
  • Don't keep perfumes or scented products in your bedroom.
  • Wear a lighter fragrance (or no fragrance at all), during warm weather. Fragrance intensifies with heat.
  • Make sure you wear a reasonable amount of fragrance. No one more than an arm's length away from you should be able to smell your fragrance.
View a free downloadable video on scents

The New Brunswick Lung Association has created a 4-part downloadable video on scents. You can view the video through their web page on scents.


1.  Kumar P, Caradonna-Graham VM, Gupta S, Cai X, Rao PN, Thompson J. Inhalation challenge effects of perfume scent strips in patients with asthma. Ann Allergy Asthma Immunol. 1995 Nov;75(5):429-33. Accessed July 7, 2008.

2.  Neurotoxins at Home and in the Workplace: Report to the Committee on Science and Technology: U.S. House of Representatives, 99th Cong., 2nd session, RC347.5.N489 (1989).

3. “Diethyl phthalate” entry in HazMap: Occupational Exposure to Hazardous Agents. . Accessed November 27, 2007.