When Disability Recognition Fails: Accommodation Refusals and Socioeconomic Challenges Among Canadians with Multiple Chemical Sensitivity.

Multiple chemical sensitivity (MCS), a recognized disability, is a chronic, multisystem condition in which exposure to common chemical substances provokes adverse health effects and functional impairment. Although population-level data and emerging clinical research support the pathophysiological basis of MCS, individuals living with the condition frequently encounter barriers to recognition and accommodation across employment, healthcare, and housing systems. This study examines patterns of accommodation requests, refusals, and associated socioeconomic impacts among adults living with MCS in Canada, with particular attention to how institutional recognition shapes access to supports. To our knowledge, this is the first national Canadian study to examine accommodation request outcomes across both employment and housing among adults with MCS, combining quantitative and qualitative data. A national cross-sectional survey of 119 Canadian adults living with MCS was conducted between January and February 2021. Quantitative data were analyzed descriptively to assess accommodation requests, outcomes, employment status, income, and housing stability. Qualitative responses were analyzed thematically to contextualize participants' experiences of disclosure, and accommodation outcomes. Participants were predominantly female (87%) with post-secondary education (90%). Among participants who reported being unemployed (29%), 94% attributed it primarily to MCS-related limitations. Accommodation denial was common: 85% of respondents reported requesting accommodations, and 78% of those experienced refusals. On housing conditions, 52% reported living in unsafe housing (defined as housing with the presence of mould or symptom-triggering exposures), while 17% reported being homeless (e.g., moving frequently, personal vehicle, tent). Findings should be interpreted in light of the cross-sectional design, self-reported data, and community-based recruitment, which may limit generalizability. The findings suggest that inconsistent institutional recognition of MCS can function as a barrier to accommodation, contributing to health, economic, and social inequities. Addressing these barriers requires clarified guidance on the duty to accommodate multiple chemical sensitivity, proactive scent-free and lowest-emission policies in workplaces and housing, and improved healthcare provider education to support accommodation documentation.