Data were obtained from the PollenSense network at: https://www.pollensense.com/pages/data-api. Data were obtained from the National Allergy Bureau at: Madison, WI -- https://pollen.aaaai.org/#/station/d816b04e-aca1-4181-b965-393b60a10ca1/calendar/2022/5 and Draper, UT -- https://pollen.aaaai.org/#/station/575c20d1-846d-4ae3-bdb1-8aed42847a4a/calendar/2022/5. All other sample data were originally collected by the NADP, and samples were analyzed by the Wisconsin State Laboratory of Hygiene, Madison, Wisconsin, and Aerobiology Research Laboratory, Nepean, Ontario, Canada. Data were compiled by WSLH personnel and sent to USGS in spreadsheets. National Atmospheric Deposition Program precipitation depth data were obtained by request from the NADP Data Manager to obtain 15-minute records. Daily NADP precipitation data are available at:https://nadp.slh.wisc.edu/precipitation/ , and precipitation chemistry data are available at: https://nadp.slh.wisc.edu/ntn-site-list/ .