A scoping review of the benefits of face mask use on pedestrian and bicyclist exposure to air pollutants

Abstract: A growing body of research suggests that pedestrians and bicyclists are exposed to substantial levels of harmful air pollutants, including particulate matter and carbon monoxide, during their daily commutes. Disposable and cloth face masks are well-known personal interventions for pedestrian and bicyclist pollutant exposure. However, there is a lack of consistent messaging from public health officials regarding how effective these masks are. Methods: This study used a scoping review to assess the existing literature on face masks as a personal intervention against the harmful effects of air pollution for pedestrians and bicyclists. Results: The studies reviewed suggested that face mask use improves health measures in pedestrians after walks in polluted urban areas. Specifically, disposable N95 respirators were the most effective commercially available face masks models evaluated, with surgical masks and cloth masks with exhalations vents also effective. Additionally, perceptions of face masks against air pollution were generally positive among citizens. Conclusion: Although the scope of the evidence reviewed was relatively limited, it consistently suggested that mask use may be an effective and inexpensive personal intervention against air pollution for pedestrians and bicyclists. Public health organizations should consider encouraging the continued use of face masks as a personal abatement strategy of air pollution exposure during the post-pandemic stage.

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