Wildfires and the COVID-19 pandemic: a systematized literature review of converging health crises

The emergence and global spread of the COVID-19 pandemic in 2020 converged with wildfire seasons of unprecedented extent. These co-occurring crises brought the potential for amplified health impacts. A systematized literature review was conducted to identify the health impacts from co-exposure to wildfires and the COVID-19 pandemic. A search of PubMed and Scopus identified 373 distinct references which were screened according to predetermined criteria. A total of 22 peer-reviewed publications were included in the final analysis. Studies were located in Australia and the western United States, with a single study in the Amazonian region of Brazil. The studies identified focused primarily on the impact of wildfire smoke exposure on COVID-19 infection and mortality, and the impact of exposure to both crises on mental health. The collective evidence shows that wildfire exposure within the context of the pandemic exacerbated COVID-19 infection and mortality as well as various adverse mental health effects. Additional research is needed in more diverse contexts and with individual-level data. Findings highlight the need for public health preparedness to anticipate overlapping, related crises and to advance climate change mitigation to protect public health.