Abstract
Wildfires are increasing in intensity and frequency, and wildfire smoke has been shown to exacerbate atopic dermatitis and itch for patients at one tertiary care medical center in San Francisco, California.We hypothesized that the effects of wildfire air pollution on the skin could impact a larger population, as detected by trends in online searches. Information seeking behaviors on the internet can reflect shifts in population-level interests related to short-term events, such as episodes of poor air quality during California wildfires.We obtained daily environmental data, including particulate matter (PM2.5) concentration and smoke plume density score (0-3), for San Francisco during the wildfire season from June through November 2020 and the same months in 2016, as a negative control.We also collected search data for common skin symptoms and conditions from Google Trends, which provides a daily Search Volume Index (SVI) ranging from 0 to 100 (most interest) for each term.
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