Title: AirNow and Low Cost Sensor PM2.5 During Extreme Wildfires in Sonoma County, 2020 Description: This data collection includes AirNow measurements of PM2.5 from the Sebastopol station as well as PurpleAir measurements of PM2.5 within Sonoma County, California, USA. Data is archived for the manuscript "Air Quality Monitoring and the Safety of Farmworkers in Wildfire Mandatory Evacuation Zones". Code used to process and analyze data can be found on GitHub: https://github.com/rrbuchholz/pm25_atmosphere_analysis_2023 Metadata URL: https://gdex.ucar.edu/dataset/id/e2ce4dca-d097-47cd-8e4d-cad09787cd19.html