Nobody should have to choose between a paycheck and breathing. Here’s what the research shows about scent at work: whose airways it hits, what workplace limits leave out, what people say they’ve lost, and why most fragrance-free policies in one review wait for someone to ask first.
Evidence key Strong Moderate Weak How we grade
Scented products in workplace asthma records
Over 20 years (1993–2012), California's work-related asthma surveillance confirmed 270 cases linked to perfume or air fresheners at work, 3.8% of all confirmed cases; perfume was the 9th most common workplace asthma exposure. Moderate evidence. Weinberg 2017
Cleaning products show up in the same records. Cleaning products were the suspected exposure in 236 of 1,915 (12%) confirmed work-related asthma cases across California, Massachusetts, Michigan, and New Jersey, 1993-1997; most were new-onset asthma (80%) and about a fifth were consistent with reactive airways dysfunction syndrome, an irritant-induced, non-allergic asthma type. Moderate evidence. Rosenman 2003
In California, janitors and cleaners had roughly double the confirmed work-related asthma rate of all other occupations combined (4.3 vs 2.3 per 100,000 workers). Moderate evidence. Rosenman 2003
Hospitals are workplaces too. Weekly use of disinfectant/cleaning sprays at work was associated with worse asthma control in US nurses (OR 1.50, 95% CI 1.16-1.94 for poorly controlled; OR 1.38, 95% CI 1.00-1.92 for very poorly controlled), and the association held even among nurses who used sprays less than once a week. Moderate evidence. Dumas 2017
Workplace limits weren’t set for people with asthma
Being below a standard occupational exposure limit does not mean an irritant gas is safe for someone with asthma: chamber studies found severe asthma attacks from sulfur dioxide and sulfuric acid at concentrations at or below typical workplace limits for those substances. Moderate evidence. Johansson 2016
Those chamber studies tested sulfur dioxide and sulfuric acid, not fragrance. They still show who a workplace limit leaves out. Chamber studies show irritant gases cause severe airway narrowing in people with asthma at concentrations at or below standard workplace exposure limits: asthmatics had severe bronchoconstriction to sulfur dioxide at about 0.4 ppm (1.1 mg/m3) after just 5-10 minutes of exercise, and to sulfuric acid at about 1 mg/m3. Strong evidence. Kleinbeck & Wolkoff 2024 Industry-funded
A systematic review of workplace irritants found that people with pre-existing airway sensitivity (atopy plus non-specific bronchial hyper-responsiveness) can develop new-onset asthma from chronic, repeated exposure to an irritant at concentrations below the official occupational exposure limit. Moderate evidence. Baur, Bakehe & Vellguth 2012
And for many chemicals, there’s no agreed limit to point to. A systematic comparison of occupational exposure limits from 18 countries and agencies found that only 25 of 1,341 chemicals studied have a limit set by every agency, and more than a third of the chemicals are regulated by only one of the 18. Strong evidence. Schenk et al. 2008 Industry-funded
Scent and the voice box
About 80% of workers with scent- and irritant-triggered irritable larynx syndrome were women, versus 24–52% of workers with occupational asthma at the same clinic. Moderate evidence. Hoy 2010
Occupational lung specialists treating irritable larynx syndrome recommend a 'low-scent' workplace policy or respiratory protection to limit exposure to triggers. Moderate evidence. Hoy 2010
What people say they’ve lost
Among the 11.2% of US adults who self-identified as chemically hypersensitive, about 2 in 3 (66.7%) described their symptoms as severe or moderately severe, and about 1 in 7 (13.2%) said they had lost a job because of it; 72.7% had changed their household or personal-care products. Moderate evidence. Caress & Steinemann 2003
Among Atlanta-area adults who reported chemical hypersensitivity, about 1 in 7 (13.5%) said they had lost a job because of it (1.8% of the entire sample), and about 3 in 10 (29.9%) said it made shopping in stores difficult. Moderate evidence. Caress & Steinemann 2003 (EHP)
About 1 in 7 Danish adults (14%) reported fragrance-triggered symptoms at least weekly, and 5% had changed where they shop, how they travel, or how they work because of them. Moderate evidence. Elberling 2005
Across 13 independent qualitative studies from four countries, people with multiple chemical sensitivity consistently describe being kept out of everyday places by scented/chemical products, and losing jobs, income, or social relationships because of it. Moderate evidence. Driesen 2020
One Canadian survey on asking for accommodation
One Canadian survey asked people with multiple chemical sensitivity (MCS) how their requests went. MCS is legally recognized as a disability in Canada, but in a national survey most people with MCS who asked for a workplace or housing accommodation before the pandemic (85% of 119) were refused at least once (the paper's own figure: 'at least 78%'). Moderate evidence. Diallo 2026
Fear of retaliation, stigma, and losing support increasingly kept Canadians with MCS from even requesting an accommodation: the share who did not request one nearly tripled, from 15% before the COVID-19 pandemic to 42% after, and every listed fear-based reason for not requesting increased over the same period. Moderate evidence. Diallo 2026
Most policies in one review wait for a request or complaint
Only about 1 in 3 (36.5%) of 63 reviewed fragrance-free policies set a default fragrance-free standard; most instead require an individual to request accommodation or file a complaint before anything changes. Moderate evidence. Roy et al. 2026 (scoping review)
A policy that only starts after someone asks puts the first step on the person who needs the change. Some places don’t wait. After a 1993 ADA complaint over municipal-employee perfume use, San Francisco voluntarily adopted a policy requiring public meeting notices to ask attendees to refrain from wearing perfume or other scented products, to let people with environmental illness or multiple chemical sensitivity attend. Moderate evidence. DOJ Civil Rights Division 1993 (TAL 383)
More people prefer fragrance-free workplaces than scented ones
About twice as many Australians would prefer fragrance-free workplaces (42.8%) as fragranced ones (22.2%), and over three times as many prefer unscented flights (57.7% vs 16.3%). Moderate evidence. Steinemann 2017
More UK adults prefer fragrance-free over fragranced workplaces (44.7% vs 23.3%), health care (43.3% vs 26.7%) and airplanes (61.9% vs 18.4%). Moderate evidence. Steinemann 2018
Inside a fragrance and flavor factory
In a French fragrance-and-flavor factory, the company's own measurements found the butter-flavor chemical diacetyl (linked to 'popcorn lung' in US factory workers) in workers' breathing air at 0.05–9 ppm during short tasks; 29 of 31 samples were above the 15-minute limit of 0.1 ppm recommended by the EU's scientific committee on occupational limits. Moderate evidence. Angelini 2016 Industry-funded
A fragrance-and-flavor company reported that about half of the chemicals it handles are classified hazardous, and that few of the more than 3,000 flavoring substances in use have workplace exposure limits. Moderate evidence. Angelini 2016 Industry-funded
What to do
- Read our workplace guide for what to ask for and how to talk with your doctor.
- Use the letter builder to write a request to your manager or HR.
- Check your rights before you ask, so you know which rules may apply where you live.
- Send your employer our guide for employers, with a fragrance-free policy that covers cleaning products and air fresheners, not just perfume.
- Put up a printable sign and hand out the fact sheet.
More on scent and breathing: fragrance and asthma and scented cleaning.
Every claim above shows its evidence grade and names its source. See all the workplace facts and the claims we won’t make. Information, not medical or legal advice.