When Disability Recognition Fails: Accommodation Denial and Socioeconomic Exclusion Among Canadians with Multiple Chemical Sensitivity

1. Introduction

Multiple chemical sensitivity (MCS) is a recognized disability [1,2,3,4], which is increasing in prevalence. It is a chronic, multisystem condition in which exposure to low levels of common chemical substances leads to recurrent adverse health effects. Triggers frequently include fragranced consumer products, cleaning agents, pesticides, building and renovation materials, and vehicle exhaust [5,6,7]. A widely cited conceptual model describes MCS as involving an initial sensitizing exposure, followed by symptom elicitation upon subsequent exposures at levels tolerated by the general population [8,9,10]. Clinical manifestations are heterogeneous and may involve neurological, respiratory, gastrointestinal, cardiovascular, endocrine, and musculoskeletal systems [11,12]. For many individuals, symptoms fluctuate in relation to environmental exposures, resulting in substantial functional impairment and constraints on daily activities, employment, and social participation [13,14].

Over the past two decades, a growing body of international research has strengthened evidence for the biological and pathophysiological basis of MCS, advancing understanding of its mechanisms, symptom patterns, and impacts on health and quality of life [9,10]. Despite this expanding literature, recognition of MCS within healthcare systems remains inconsistent. Individuals with MCS frequently encounter skepticism, diagnostic uncertainty, and fragmented care pathways, which can delay access to appropriate management and exacerbate illness trajectories [13,15,16]. These barriers are not limited to clinical interactions but extend into broader institutional contexts where medical recognition functions as a prerequisite for access to support and accommodations.

Population-level data indicate that MCS represents a significant and growing public health concern in Canada. Analyses of Statistics Canada’s Canadian Community Health Survey (CCHS), synthesized and reported by the Association pour la santé environnementale du Québec - Environmental Health Association of Québec (ASEQ-EHAQ), indicate that more than 1.3 million Canadians were living with diagnosed MCS by 2020 [5,14,17]. Preliminary Statistics Canada data from January–July 2025 further suggest that approximately 3.1 million Canadian adults (9.4%) reported MCS, while approximately 900,100 adults (2.7%) report receiving a medical diagnosis [18]. In addition, individuals with MCS experience disproportionate health complexity: 77.8% report at least one additional chronic condition, whereas 45.0% of the general population report comorbidity [19]. Prevalence of specific comorbidities is markedly elevated, including asthma (25.7% vs. 8.3%) and non-food allergies (61.1% vs. 26.6%) [20]. These patterns underscore the cumulative health burden associated with MCS and the corresponding need for responsive care and accommodation systems.

Despite its prevalence and complexity, MCS remains under-recognized and under-resourced. Individuals frequently report consulting multiple healthcare providers before finding one with sufficient knowledge of the condition, a process that is financially and logistically burdensome and may exclude those with fewer resources [21]. Compounding this challenge, healthcare and institutional environments often involve routine exposure to chemical triggers, such as fragranced products, disinfectants, and cleaning agents, creating additional barriers to accessing care [21]. In Ontario, the Task Force on Environmental Health estimated that more than 740,000 residents live with MCS and 2 other comorbidities characterized these conditions as “profoundly life altering”. The Task Force concluded that MCS remains poorly recognized and inadequately managed within the health system, citing shortages of knowledgeable providers, limited clinical tools, and insufficient services and support [22]. By 2020, diagnosed MCS cases exceeded 400,000 in Ontario alone [5,17]

Barriers associated with MCS extend beyond healthcare into employment, housing, and other domains of social participation. In systems where access to accommodation, such as fragrance-free workplaces or low-emission housing, depends on medical validation, lack of recognition functions as a structural barrier to inclusion [14,23,24]. As a result, individuals with MCS are frequently denied workplace accommodations [25], compelled to live in unsafe or unstable housing environments [26,27], and experience elevated risks of unemployment, poverty, and social isolation [6,15,28]. These outcomes occur despite high levels of education and work experience among many individuals with MCS [29], indicating that exclusion is driven primarily by environmental and institutional barriers rather than individual capacity.

Previous analyses based on the present dataset have examined environmental exposure pathways associated with MCS onset and symptom triggering, as well as the impacts of COVID-19 public health measures on healthcare access for individuals with MCS [12,16]. Building on this foundation, the current study focuses on a distinct but related dimension of exclusion: the denial of disability accommodations in employment and housing contexts. Using quantitative and qualitative data from a national cross-sectional survey of Canadian adults living with MCS, this paper examines patterns of accommodation requests and refusals, perceived barriers to disclosure, and the socioeconomic consequences of denied access. By centering lived experience alongside population-level indicators, the study illuminates how institutional recognition and legitimacy shape accommodation outcomes and contribute to structural inequities affecting people with MCS.

2. Materials and Methods

2.1. Study Design

This study employed a cross-sectional survey design to examine accommodation experiences and socioeconomic impacts among Canadian adults living with MCS. Data collection occurred between January 19 and February 12, 2021, during the COVID-19 pandemic. The survey included both current and retrospective questions, allowing participants to report experiences prior to and following the implementation of pandemic-related public health measures.

The present analysis forms part of a broader research program examining barriers faced by individuals with MCS across social determinants of health. This paper focuses specifically on accommodation requests and outcomes in employment and housing settings, as well as perceived retaliation, disclosure-related concerns, and downstream socioeconomic effects.

2.2. Ethics Approval

This study received ethical approval from the Women’s College Hospital Research Ethics Board (Protocol #2020-0157-E). All study procedures complied with the principles of the Declaration of Helsinki. Participants provided informed consent electronically prior to participation. Survey responses were anonymized and deidentified to protect confidentiality. No financial incentives were provided.

2.3. Participants and Eligibility

Participants were eligible to take part if they:

• were 18 years of age or older;
• resided in Canada;
• had experienced symptoms consistent with MCS for at least one year prior to March 11, 2020; and
• were able to complete the survey in English or French.

Eligibility was confirmed through a brief pre-screening questionnaire. Only individuals meeting all criteria were directed to the full survey.

2.4. Data Collection and Recruitment

Participants were recruited using a national, multi-channel strategy that included organizational websites, social media platforms, targeted online advertising, and direct outreach through ASEQ-EHAQ mailing lists. Recruitment materials invited individuals living with MCS to share their experiences related to access, accommodation, and quality of life.

The survey was administered using the Qualtrics XM platform. Participation was voluntary and anonymous. To reduce access barriers, respondents who were unable to complete the survey online were offered the option of telephone-based participation with trained interviewers.

A total of 373 individuals accessed the survey. Of these, 119 met inclusion criteria and completed the full questionnaire, forming the analytic sample for this study.

2.5. Survey Instrument

The survey comprised 84 items, of which 16, relevant to this analysis, were assessed. These included experiences with accommodation processes in employment and housing, such as whether accommodation was requested, the outcomes of those requests, and reasons for not seeking accommodation. Other questions captured changes in employment status, household income, housing conditions, and perceived socioeconomic impacts of accommodation outcomes.

Survey items were developed collaboratively with researchers, clinicians, and individuals with lived experience of MCS, and were pilot-tested with members of the MCS community to ensure relevance and content validity.

2.6. Data Analysis

Quantitative data were analyzed descriptively using frequencies and percentages to characterize accommodation requests, refusal rates, employment status, income, and housing conditions. Where appropriate, subgroup comparisons were conducted to examine relationships between accommodation outcomes and socioeconomic indicators.

Qualitative responses were analyzed using thematic analysis. Open-ended responses were coded inductively to identify recurring patterns related to disclosure, accommodation denial, emotional impacts, and adaptive strategies. Qualitative findings were used to contextualize quantitative results and provide insight into the lived experience of navigating accommodation systems.

3. Results

3.1. Summary of Key Results

Across domains, the findings indicate that adults living with MCS experience persistent and interrelated barriers to safe participation in employment, housing, and healthcare. Despite high levels of education, participants reported elevated unemployment, low income, and housing insecurity, with more than half residing in environments that exacerbated MCS symptoms. Accommodation requests were frequent and often repeated, yet denials were common both before and during the COVID-19 pandemic. Fear of stigmatization, retaliation, and prior negative experiences further deterred accommodation seeking, particularly following the onset of pandemic-related public health measures. Housing instability emerged as a critical vulnerability, with increased chemical exposures linked to infection-control practices contributing to displacement and reduced access to safe living environments. Collectively, these results illustrate how institutional responses that rely on medical validation and chemically intensive practices can systematically restrict access to essential accommodations, reinforcing socioeconomic instability and health risk among individuals with MCS

3.2. Participant Characteristics

3.2.1. Sociodemographic Profiles

The analytic sample comprised 119 adults who self-identified as living with MCS and met all eligibility criteria, including being 18 years of age or older, residing in Canada, and having experienced MCS-related symptoms for at least one year prior to March 11, 2020.

Most respondents identified as women (87%, n = 103), while 13% (n = 16) identified as men. Participants ranged in age from 25 years to over 75 years, with 68% between 45 and 74 years of age. Respondents were primarily residents of Quebec (45%;n=54) and Ontario (35%, n=42) Table 1.

3.2.2. Socioeconomic Characteristics

The vast majority of respondents (57%, n=68) have a university degree, and 39% (n=46) were employed. Among participants who were unemployed (29%, n=34), 94% (n=32) attributed their job loss directly to limitations associated with MCS. Other chronic conditions (such as fibromyalgia) were also reported as a reason for unemployment by 16% of respondents (n=19). Most respondents (26%, n=31) reported an annual household income below $25,000 CAD.

Prior to March 2020, 29% of participants (n=34) were unemployed. Among participants who were unemployed during this period, the vast majority (94%, n=32) attributed their job loss directly to limitations associated with MCS.

Table 2. Socioeconomic Characteristics of Participants.

Variable	Category	n (%)
Education (N=119)	Secondary Only	9 (8)
	College/CEGEP	40 (34)
	University	68 (57)
	Prefer not to answer	2 (2)
	Other	3 (2)
Work Status (N=119)	Employed	46 (39)
	Unemployed	34 (29)
	Retired or Student	39 (33)
Reason(s) for unemployment* (N=34)	MCS condition	32 (94)
	Other***	19 (16)
	COVID-19 health measures	8 (24)
Annual Income (N=119)	≤ $20,000	31 (26)
	$20,001–$40,000	17 (14)
	$40,001–$60,000	21 (18)
	$60,001–$80,000	14 (12)
	> $80,000	21 (18)
	No income	1 (1)
	Prefer not to answer	14 (12)

* Percentages may be superior to 100% due to rounding. **Participants could select multiple options. ***Other include Fibromyalgia, chemical exposure in the workplace.

Table 2. Socioeconomic Characteristics of Participants.

Variable	Category	n (%)
Education (N=119)	Secondary Only	9 (8)
	College/CEGEP	40 (34)
	University	68 (57)
	Prefer not to answer	2 (2)
	Other	3 (2)
Work Status (N=119)	Employed	46 (39)
	Unemployed	34 (29)
	Retired or Student	39 (33)
Reason(s) for unemployment* (N=34)	MCS condition	32 (94)
	Other***	19 (16)
	COVID-19 health measures	8 (24)
Annual Income (N=119)	≤ $20,000	31 (26)
	$20,001–$40,000	17 (14)
	$40,001–$60,000	21 (18)
	$60,001–$80,000	14 (12)
	> $80,000	21 (18)
	No income	1 (1)
	Prefer not to answer	14 (12)

* Percentages may be superior to 100% due to rounding. **Participants could select multiple options. ***Other include Fibromyalgia, chemical exposure in the workplace.

3.3. Housing Characteristics and Residential Stability

Regarding housing conditions, 48% (n=57) reported living in what they considered to be safe housing - defined as environments that minimize exposure to chemical triggers such as fragrances, mould, renovation materials, emissions from neighbouring units, or nearby traffic and industrial sources. Conversely, 52% (n=62) indicated that their current housing did not meet these criteria, suggesting ongoing exposure risks within daily living environments.

Most participants were residing in conventional housing arrangements, including owned, rented, or subsidized housing at the time of the survey (81%, n=96). However, a notable proportion reported experiences consistent with housing instability or homelessness. At the time of data collection, 17% (n=20) described living situations involving frequent relocation, temporary stays with friends or family, personal vehicles, or tents. On living arrangements, 42% (n=50) reported living with 1 other person, while 39% (n=46) reported living alone. Table 3.

3.4. Accommodation Requests and Outcomes

Among the 119 participants, the majority (85%, n = 101) reported having submitted at least one accommodation request in the year prior to March 11, 2020, for their disability. Among those, more than half of participants (76%, n = 77) reported submitting five or more requests, and 78% were denied at least once. Table 4.

3.5. Barriers to Requesting Accommodations

Participants who reported not having requested accommodations were asked to identify factors contributing to this decision. Prior to March 11, 2020, 18 respondents provided reasons for not pursuing accommodation requests. As presented in Table 5, the most commonly cited barriers were prior negative experiences when requesting accommodations and fear of being stigmatized (44%, n=8).

Additional deterrents included concern about offending others, perceived lack of understanding or support related to MCS, and fear of retaliation, each identified by 39% of respondents (n=7). Fear of verbal abuse was also reported by one-third of participants (33%, n=6).

Following March 11, 2020, participants reported reasons for not pursuing accommodation requests. The most frequently cited barriers during this period were prior negative experiences when requesting accommodations and concerns about losing respect if perceived as difficult, each reported by 50% of respondents (n=25).

Other commonly reported deterrents included a perceived lack of understanding of MCS within support systems and fear of verbal abuse, both identified by 46% of participants (n=23). Fear of losing professional support (44%, n=22) and fear of being stigmatized (44%, n=22) were also prominent. Table 5.

3.6. Qualitative Themes: Experiences of Accommodation Denial

The qualitative data were analyzed using a disability-access lens, focusing on how institutional norms, credibility assessments, and power asymmetries shape accommodation outcomes. Five interrelated themes were identified:

• Theme 1: Legitimacy as a Gatekeeper to Accommodation: Participants repeatedly described accommodation systems that require medical or institutional validation before access needs are acknowledged. In the absence of formal recognition of MCS, requests for environmental accommodations were routinely dismissed, delayed, or ignored.

“Because my health condition is not recognized and I feel I don’t have any rights.”

This theme illustrates how access is not determined by functional need, but by whether a condition is perceived as legitimate within medical or bureaucratic hierarchies. Even when symptoms were severe, participants described being unable to translate lived experience into recognized entitlement.

• Theme 2: Cycles of Exposure and Repeated Refusal: Rather than isolated denials, participants described repeated cycles in which exposure to triggering environments was followed by accommodation requests, which were then refused - often multiple times.

“Even though I asked for accommodation, I was always terrified, always scared and feared for my safety. Sometimes people would increase the activity.”

“Too afraid to ask for help or accommodation. People sometimes increase what they are doing because I asked them to stop.”

These accounts reveal how denial is not passive. In some cases, requests for safer environments appeared to provoke increased exposure, intensifying both health risks and emotional distress.

• Theme 3: Anticipated Harm and Strategic Non-Disclosure: Many participants reported choosing not to request accommodation due to fear of retaliation, loss of housing or employment, or social hostility. This anticipatory harm-shaped behaviour even in the absence of explicit refusal.

“The abuse taken for having asked for accommodation, stigma, privacy concerns, likelihood of refusal.”

• Theme 4: Social Withdrawal as a Form of Self-Protection: Some participants described withdrawing from social, professional, or housing-related interactions as a protective strategy to reduce exposure and avoid repeated conflict. Rather than continuing to request accommodations, individuals limited engagement altogether, accepting isolation as a trade-off for safety. Accommodation systems that penalize disclosure effectively shift responsibility onto individuals, forcing them to choose between health protection and social survival. Repeated social adversity resulted in emotional exhaustion, reducing participants’ capacity to advocate for accommodation consistently.

While this strategy reduced immediate exposure, it often came at the cost of social participation, reinforcing isolation and exclusion.

“I don’t interact with people much; when I do I wear a mask; so I don’t have to ask for accommodation. This has relieved me of a lot of anxiety!”

• Theme 5: Emotional Exhaustion and Advocacy Fatigue: Repeated denials, combined with ongoing health challenges, resulted in profound emotional fatigue. Participants described reaching a point where continued self-advocacy was no longer sustainable.

“…always worried about repercussions and if I would have the energy to ask for the 10th time…”

This theme underscores the idea that accommodation systems relying on persistence and resilience privilege those with greater resources, energy, and social capital - systematically disadvantaging people with chronic, disabling conditions.

Table 6. Thematic analysis of accommodation denial and its consequences.

Theme	Description
Legitimacy as Gatekeeper to Accommodation	Accommodation access contingent on medical or institutional recognition rather than functional need
2. Cycles of Exposure and Refusal	Repeated accommodation denials following ongoing chemical exposure
3. Anticipated Harm and Non-Disclosure	Fear of retaliation or social consequences deters accommodation requests
4. Social Withdrawal as Self-Protection	Avoidance of interaction to reduce exposure and conflict
5. Emotional Exhaustion and Advocacy Fatigue	Advocacy fatigue resulting from repeated denial and institutional resistance

Table 6. Thematic analysis of accommodation denial and its consequences.

Theme	Description
Legitimacy as Gatekeeper to Accommodation	Accommodation access contingent on medical or institutional recognition rather than functional need
2. Cycles of Exposure and Refusal	Repeated accommodation denials following ongoing chemical exposure
3. Anticipated Harm and Non-Disclosure	Fear of retaliation or social consequences deters accommodation requests
4. Social Withdrawal as Self-Protection	Avoidance of interaction to reduce exposure and conflict
5. Emotional Exhaustion and Advocacy Fatigue	Advocacy fatigue resulting from repeated denial and institutional resistance

4. Discussion

This study demonstrates that barriers to accommodation for individuals living with MCS are not the result of isolated misunderstandings or interpersonal conflict but are produced through institutional systems that rely on legitimacy-based thresholds to determine access. Despite high rates of accommodation requests, participants experienced repeated refusals across employment and housing contexts, with significant consequences for health, economic stability, and social participation.

The findings indicate that accommodation systems operate as gatekeeping mechanisms, privileging conditions that align with dominant biomedical frameworks while marginalizing those that remain inconsistently recognized in clinical and institutional practice [14,23]. In this context, MCS functions as a contested condition, limiting individuals’ ability to translate functional impairment into formally recognized access needs. In this study, functional impairment refers to restrictions in an individual’s ability to safely access and participate in work, housing, healthcare, and social environments as a result of environmentally triggered symptoms, rather than limitations in capacity or motivation. As a result, participants were frequently required to repeatedly justify accommodation requests, often without success.

Quantitative findings underscore the systemic nature of this exclusion. Prior to March 2020, 85% of participants reported submitting at least one accommodation request, and among those, 47% experienced five or more refusals. Nearly half of the sample reported making repeated accommodation requests over time. These patterns were observed across employment, housing, and service environments, indicating cross-sectoral barriers rather than isolated policy failures. As one participant summarized, the impact of this lack of recognition:

“Because my health condition is not recognized and I feel I don’t have any rights.”

The socioeconomic consequences of accommodation denial were substantial. Employment data revealed that 94% of unemployed participants attributed job loss directly to MCS-related limitations. These outcomes occurred despite high educational attainment within the sample, with nearly 91% holding post-secondary qualifications. Consistent with Canadian Community Health Survey, participants with MCS experienced disproportionately low incomes, high rates of solitary living, and elevated economic precarity, highlighting how environmental exclusion - not individual capacity - drives labour force marginalization [17,19,28].

Housing emerged as a critical site of vulnerability. More than half of participants reported living in environments that were unsafe for their condition, and a subset described housing instability or circumstances consistent with homelessness. For individuals whose health is directly shaped by environmental exposures, lack of access to safe housing represents a fundamental threat to well-being. These findings align with environmental justice research demonstrating how marginalized populations bear disproportionate exposure burdens due to constrained housing options and institutional neglect [26,27].

Importantly, qualitative findings indicate that exclusion extends beyond formal denial. Fear of stigmatization, retaliation, and social hostility led many participants to avoid requesting accommodations altogether, particularly following negative prior experiences. This anticipatory withdrawal reflects environments in which disclosure itself carries risk.

Such responses illustrate how accommodation systems can incentivize silence and withdrawal, effectively shifting the burden of exclusion onto individuals. Rather than facilitating access based on functional need, current structures reward persistence while disregarding cumulative harm. For people with MCS - whose condition is chronic, multisystem, and environmentally mediated - this model produces predictable patterns of health deterioration, economic insecurity, and social isolation.

Taken together, these findings suggest that accommodation denial should be understood as a mechanism of structural exclusion rather than a series of isolated failures. When legitimacy is conferred through narrow diagnostic recognition, individuals with MCS are systematically excluded from environments essential to participation in work, housing, and community life. Addressing these inequities requires institutional reforms that move beyond individual adjudication toward access frameworks grounded in functional impact, environmental safety, and disability inclusion.

5. Conclusions

This study provides robust evidence that denial of accommodation for individuals with MCS is a systemic issue rooted in institutional practices that privilege perceived medical legitimacy over functional accessibility. Despite clear and repeated expressions of need, participants encountered persistent barriers across employment and housing contexts, resulting in significant health, economic, and social consequences. The vast majority (94%) of participants who reported being unemployed attributed it primarily to MCS-related limitations. Eighty-five percent of respondents requested accommodation, yet 78% of those were denied; 47% were denied more than 5 times. More than half (52%) report living in unsafe housing, defined as the presence of mould or other symptom-triggering exposures. In addition, 17% report being homeless.

These findings challenge accommodation frameworks that treat access as discretionary rather than as a fundamental component of disability inclusion. When legitimacy is required before protection is granted, individuals with contested or poorly understood conditions are structurally excluded, regardless of the severity of their impairment.

Ensuring equitable participation for people with MCS requires a shift away from legitimacy-based gatekeeping toward needs-based accommodation models grounded in human rights and health equity principles. Without such reform, individuals with MCS will continue to bear disproportionate burdens of exposure, unemployment, housing insecurity, and social isolation - outcomes that are neither inevitable nor acceptable in inclusive societies.