Scent-Free Policies: An Effective and Low-Cost Source-Control Strategy to Improving Indoor Air Quality

Indoor air quality (IAQ) is an important determinant of public health, especially for individuals with multiple chemical sensitivity (MCS). Fragrances emit volatile organic compounds (VOCs) that can contribute to poor IAQ. Although scent-free policies are being widely implemented as an accommodation for those impacted by fragrances, their ability to improve IAQ has not been examined. This study assessed if scent-free policies can improve IAQ across Canadian offices. IAQ testing was conducted between December 2023 and June 2024 in 34 offices (17 with scent-free policies, 17 without). Sampling included total VOCs (TVOCs), top 35 VOCs, formaldehyde, CO, CO₂, PM₂.₅, temperature, and relative humidity. Analyses controlled for room size, occupancy, and ventilation rate using Mann-Whitney U tests and generalized linear models. Regression analysis revealed significantly higher VOC concentrations in spaces without scent-free policies, including acetaldehyde (OR = 2.2, p