EPHT Pollen

These tables are made available as part of a collaboration between the Environmental Public Health Tracking (EPHT) Program and Timberlane Allergy & Asthma Associates. Timberlane staff count pollen from approximately March to October each year. A summary dataset is provided to the EPHT program each year, which is then analyzed and made available here. To see visualizations of these data, visit the EPHT page on the Health Department website. High Pollen Count Days Table These values are produced by calculating the percentage of days in a given week of the year that historically fell into the "high" or "very high" National Allergy Bureau categories. This percentage was then multiplied by 7, which yields the number of days in a given week that we expect to have high pollen counts. This table contains the values for each step of this calculation, as well as information about pollen type and week and month of the year. Pollen Annual Table This table contains daily pollen counts for tree, grass, weed, and ragweed pollen types as well as the National Allergy Bureau category that each day falls into for each type. Data are available from 2009-2025. *Note: Due to logistical challenges, pollen monitoring started later than normal in 2024 (April 7). In order to make 2024 data as comparable as possible to other years, older years of data were used to fill in missing data from March and the first week of April 2024. This affects tree pollen only. Daily averages for tree pollen were taken from the 2010-2023 data and filled in to the appropriate dates in 2024.本数据集由环境公共卫生追踪（Environmental Public Health Tracking, EPHT）项目与Timberlane过敏与哮喘诊疗中心合作发布。Timberlane工作人员每年约3月至10月开展花粉计数工作。该机构每年向EPHT项目提交汇总数据集，经EPHT分析后在此公开。如需查看这些数据的可视化成果，请访问卫生部门官网的EPHT专题页面。 高花粉计数日数据表 本数据表通过计算年度某一周内，历史上属于美国国家过敏局（National Allergy Bureau, NAB）划定的“高”或“极高”花粉浓度等级的天数占比，再将该占比乘以7，得到该周预计出现高花粉计数的天数。本数据表包含该计算过程各环节的数值，以及花粉类型、年度周次与月份相关信息。 花粉年度数据表 本数据表包含树木、禾本科、杂草以及豚草的每日花粉计数，以及每日各项花粉对应的美国国家过敏局等级分类。数据覆盖2009年至2025年。*注：受后勤保障限制，2024年的花粉监测工作启动时间晚于常规时段（4月7日才开始）。为尽可能使2024年数据与其他年份可比，研究团队使用过往年份的数据集补全了2024年3月及4月第一周的缺失数据，该补全操作仅涉及树木花粉：以2010-2023年的树木花粉日均值填充2024年对应日期的缺失值。