2.5 microns (PM 2.5) metals, organic and elemental carbon, Aerosol Mass Spectrometer (AMS)-measured non-refractory sub-1 micron (PM1) composition, and oxidative potential measurement at House sampling site in Fairbanks during Alaskan Layered Pollution And Chemical Analysis (ALPACA) 2022

This work is part of the Alaskan Layered Pollution And Chemical Analysis (ALPACA) field experiment, which was a collaborative study designed to improve understanding of pollution sources and chemical processes during winter (cold climate and low-photochemical conditions), to investigate indoor pollution, and to study the dispersion of pollution as affected by frequent temperature inversions. In this specific work, the oxidative potential (OP) of outdoor particulate matter up to 2.5 microns in diameter (PM2.5), in wintertime Fairbanks, Alaska, is investigated. Approximately 40 filter samples of ambient PM2.5 collected from January 17th to February 25th, 2022 at a Fairbanks residential site (House site) were analyzed for OP and various chemical components of PM, including organic carbon (OC), elemental carbon (EC), brown carbon (BrC) and metals. The sensitivity of OP assay to specific aerosol components and sources can provide insights beyond PM2.5 mass concentration when assessing air quality.本研究隶属于阿拉斯加分层污染与化学分析（Alaskan Layered Pollution And Chemical Analysis, ALPACA）野外实验项目。该项目为一项协作型研究，旨在提升对冬季（寒冷气候与低光化学条件下）污染来源与化学过程的认知，探究室内污染情况，并研究频繁逆温条件对污染扩散的影响。本项具体研究针对美国阿拉斯加州费尔班克斯冬季时节直径不超过2.5微米的室外颗粒物（PM2.5）的氧化潜能（oxidative potential, OP）展开分析。研究人员于2022年1月17日至2月25日期间，在费尔班克斯一处居民区采样点（住宅站点）采集了约40份环境PM2.5滤膜样本，并对其中的氧化潜能以及PM的多种化学组分（包括有机碳（OC）、元素碳（EC）、棕碳（BrC）与金属元素）进行了检测分析。相较于仅基于PM2.5质量浓度开展的空气质量评估，对氧化潜能检测结果与特定气溶胶组分、污染源之间关联敏感性的分析，能够提供更多维度的认知视角。