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Aims and objectives: Ambient PM2.5 is associated with higher rates of COVID-19 infection and severe disease. Yet it is unclear whether medium-term extreme PM2.5 events such as coalmine fires also increase risk, or how long the vulnerability lasts. We evaluated COVID-19 outcomes in a cohort of people exposed to smoke from the 2014 Hazelwood coalmine fire. Methods In late 2022, we surveyed members of an Adult Cohort to determine long-term health effects of the coalmine fire. COVID-19 infections were identified with validated self-report tools and symptom-based algorithms. PM2.5exposure was determined from time location diaries and modelled air pollution estimates. Hospitalisation for COVID-19 served as a proxy for severity. We conducted logistic regressions, and adjusted for demographics, smoking, socioeconomic status and asthma/COPD. Results Of 612 participants completing the survey, 44% (n …