Weekly Grouped Pollen Season Timing and Concentrations (Trees and Weeds) for Select United States Cities, 2003-2024

The National Allergy Bureau™ (NAB™) commonly provides grouped pollen levels. In this dataset, grouped trees and grouped weeds are provided as weekly pollen concentrations using data from the NAB. Grouped grass pollen metrics were excluded from selected products to align with data-sharing policies. Public release of grouped grass data could allow inference of taxa-specific concentrations in some contexts; therefore, these metrics are not included.

Pollen concentrations are reported as pollen grains per cubic meter (PPCM) and provided for each calendar week. This dataset is part of a series of pollen datasets from the NAB, processed and standardized by the Division of Environmental Health Science and Practice (DEHSP), National Center for Environmental Health (NCEH), CDC. Further details about the pollen data, including collection, counting, and calculations, can be found here: https://www.mdpi.com/3954654