Fig 1.
Average weekly air pollution (PM2.5) in San Francisco and search volume index (SVI) for representative search terms. A, The San Francisco search volume index for representative positive control (“smoke”), negative control (“cup”), and skin (“eczema” and “itchy”) search terms in 2020. The horizontal lines at the top correspond to the dates on the x-axis to indicate the time frame of wildfires as well as the approximate number of acres burned and distance from San Francisco. Bars represent the concentration of particulate matter (PM2.5) in micrograms/cubic meter, and lines represent the search volume index for representative terms in each category: symptoms, diseases, and controls. B, The San Francisco search volume for representative positive control (“smoke”), negative control (“cup”), and skin (“eczema” and “itchy”) search terms in 2016. No wildfires affected San Francisco air quality during this year. Bars represent the concentration of particulate matter (PM2.5) in micrograms/cubic meter, and lines represent the search volume index for representative terms in each category: symptoms, diseases, and controls.