PM2.5 Daily Concentration

This feature layer represents 5 kilometers (km) grid cell estimates of fine particulate matter (PM2.5) 24-hour 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 24-hour design values, which are 3-year averages of annual 98th percentile concentrations (as defined by EPA for comparison to the federal 24-hour PM2.5 standard). 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 Daily 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.本特征图层呈现了2022-2024年细颗粒物（PM2.5）的5千米网格单元估算值，单位为微克每立方米（µg/m³），对应24小时设计值。由于野火烟雾暴露会单独计分，因此本次计算未纳入野火烟雾导致的PM2.5峰值。每日平均PM2.5浓度通过结合美国国家海洋和大气管理局（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，该模型考量了排放、气象与地形因素。利用上述每日平均浓度计算24小时设计值，即年度第98百分位浓度的三年平均值（该定义符合美国环境保护署（EPA）用于与联邦24小时PM2.5标准比对的规范）。本数据集由华盛顿州生态厅制作并提交至EHD制图团队。引用信息：华盛顿追踪网络、华盛顿州卫生部，网络资源"PM2.5每日浓度"，数据源自华盛顿州生态厅，2022-2024年数据，2025年9月发布。如有疑问或意见，请联系[e-mail]。