Missoula 2020 wildfire air quality observations and model simulations supporting: Characterizing emissions, chemistry, and health impacts of aged wildfire smoke in a western US city

This dataset provides hourly air quality observations and corresponding atmospheric chemistry model simulations for Missoula, Montana during the September 2020 wildfire season. The data were developed to support analyses of wildfire smoke emissions, chemical evolution, secondary pollutant formation (e.g., ozone and secondary organic aerosol), and exposure- and health-relevant metrics. The observational dataset includes hourly measurements of criteria pollutants (e.g., PM₂.₅, O₃, NOₓ, CO), a wide range of volatile organic compounds (VOCs), oxygenated VOCs (OVOCs), hazardous air pollutants (HAPs), aerosol optical properties, and meteorological parameters. Measurements are reported in local Mountain Daylight Time (MDT). The model dataset consists of hourly model-simulated concentrations extracted for Missoula under three emission scenarios: (1) a baseline wildfire-emissions simulation (GFAS), (2) a sensitivity simulation with wildfire emissions scaled by a factor of three (3×GFAS), and (3) a no-biomass-burning simulation (NoBB). Model outputs include gas-phase species, oxidant proxies, aerosol components, secondary organic aerosol tracers, and summary metrics (e.g., total VOC and HAP-like indicators), designed to be directly comparable with the observational dataset. These datasets support the manuscript “Characterizing emissions, chemistry, and health impacts of aged wildfire smoke in a western US city,” submitted to *Atmospheric Chemistry and Physics*. Separate README files are provided for the observational and model datasets, describing variables, units, data quality, and usage notes.本数据集涵盖2020年9月野火季期间，美国蒙大拿州米苏拉市的逐小时空气质量观测数据，以及与之配套的大气化学模式模拟结果。本数据集旨在支撑野火烟气排放、化学演化、二次污染物生成（例如臭氧与二次有机气溶胶），以及暴露与健康相关指标的相关分析工作。 观测数据集包含逐小时的环境空气标准污染物监测数据（例如细颗粒物PM₂.₅、臭氧O₃、氮氧化物NOₓ、一氧化碳CO）、多类挥发性有机物（Volatile Organic Compounds, VOCs）、含氧挥发性有机物（OVOCs）、危险空气污染物（HAPs）、气溶胶光学特性数据，以及气象参数。所有观测数据均以本地山地夏令时（MDT）计时。 模式数据集包含针对米苏拉市提取的逐小时模式模拟浓度数据，共涵盖三种排放情景：（1）野火排放基准模拟情景（GFAS）；（2）野火排放规模放大3倍的敏感性模拟情景（3×GFAS）；（3）无生物质燃烧模拟情景（NoBB）。模式输出结果包含气相物种、氧化剂代用指标、气溶胶组分、二次有机气溶胶示踪物，以及汇总指标（例如总VOC与类HAP指标），可直接与观测数据集开展对比分析。 本数据集支撑了投稿至《Atmospheric Chemistry and Physics》的论文稿件《Characterizing emissions, chemistry, and health impacts of aged wildfire smoke in a western US city》的相关研究工作。观测数据集与模式数据集均配有独立的README文件，分别对变量、单位、数据质量与使用说明进行详细阐述。