PM2.5 Annual Concentration

This feature layer represents 5 kilometer (km) grid cell estimates of fine particulate matter (PM2.5) annual design values from 2022-2024 in micrograms per cubic meter (µg/m3). Spikes in PM2.5 due to wildfire smoke are not included in these calculations, since wildfire smoke exposure is scored separately. Daily average PM2.5 concentrations are estimated by combining the National Oceanic and Atmospheric Administration (NOAA) forecast model with measured concentrations from the Washington Ambient Air Monitoring Network. The NOAA forecast model accounts for emissions, meteorology, and topography. These daily averages are used to calculate annual design values, which are 3-year averages of annual mean concentrations (as defined by EPA for comparison to the federal annual PM2.5 standard). Long-term exposure to these tiny particles can harm heart and lung health and contribute to chronic diseases. People most affected include children, older adults, individuals with asthma or other breathing problems, outdoor workers, and communities with fewer financial resources who may have fewer ways to reduce exposure. This data was created by the Washington Department of Ecology and sent to the EHD map team. Citation Washington Tracking Network, Washington State Department of Health. Web. "PM2.5 Annual Concentration". Data obtained from the Department of Ecology, 2022-2024 Data. Published September 2025. Contact us at [e-mail] if you have questions or comments.本要素图层（feature layer）展示了2022-2024年5千米网格单元的细颗粒物（fine particulate matter, PM2.5）年设计值估算结果，单位为微克每立方米（µg/m³）。本次计算未纳入野火烟雾导致的PM2.5峰值，因野火烟雾暴露将单独计分。每日平均PM2.5浓度通过结合美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）预报模型与华盛顿州环境空气监测网络的实测浓度进行估算。该NOAA预报模型考量了排放、气象与地形因素。上述每日平均浓度被用于计算年设计值，年设计值为年均浓度的3年平均值（符合美国环境保护署（Environmental Protection Agency, EPA）用于与联邦年度PM2.5标准比对的定义）。长期暴露于此类细颗粒物可损害心肺健康，并诱发慢性疾病。受影响最严重的人群包括儿童、老年人、哮喘或其他呼吸系统疾病患者、户外作业人员，以及经济资源匮乏、难以采取暴露防护措施的社区群体。本数据集由华盛顿州生态部（Washington Department of Ecology）制作并提交至EHD地图工作组。引用：华盛顿州卫生部（Washington State Department of Health）华盛顿追踪网络，网络资源"PM2.5 Annual Concentration"，数据源自生态部2022-2024年数据集，2025年9月发布。如有疑问或建议，请联系[e-mail]。