Particulate Matter Size and Composition Change in Response to Transport from the Outdoor to Indoor Environment

从室外环境到室内环境传输过程中颗粒物尺寸和成分的变化

• 批准号: 1437916
• 负责人: Peter DeCarlo
• 金额: $ 33.17万
• 依托单位: Drexel University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2014
• 资助国家: 美国
• 起止时间: 2014-09-01 至 2018-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1437916&HistoricalAwards=false
• 关键词: Particulate; Matter; Size; Composition; Change

1437916DeCarlo, Peter F.Particulate matter size and composition change in response to transport from the outdoor to indoor environment In the field of air pollution, very little is known about how particle composition changes in real time when particulate matter is transported from outdoors to the indoor environment. The goal of this project is online real-time characterization of particulate chemical composition and size distribution outdoors, indoors, and in the building supply air with high time resolution (6 minute cycle of 2 minute sampling at each location). The research plan intends to fortify collaboration between outdoor air quality and an indoor air quality research. Boundary lines between these two disciplines are typically rigid, but much can be learned by two groups working in concert, as is proposed here. To facilitate this interaction, workshops will be convened on outdoor and indoor air quality, bringing together investigators in our region to define a research agenda with the goal of understanding the transformations occurring when outdoor air moves indoors. Insights gained will have the potential to improve our understanding of risk due to indoor environmental exposure to outdoor particles that are transported into the indoor environment and change in composition during that transition. Finally, public outreach opportunities are prevalent in the Philadelphia area. Events such as the Philadelphia Science Fair hosted by the Franklin Institute, offer an excellent opportunity for PI DeCarlo to showcase the results of this work to members of the general public.Utilizing the unique dataset, generated by instrumentation recently acquired through an NSF MRI grant (Award 1229298), this study will examine the effect of temperature and humidity gradients on dynamic partitioning behavior of particulate matter chemical composition and size distribution as it is transported from outdoors to the indoor environment. This study will ask several questions, for example: 1) How do the changes to outdoor PM size and chemical composition from typical processes (e.g. diurnal cycles, photochemical production, weather events, seasonal cycles) influence the size resolved chemical composition of indoor PM? 2) How do changes in environmental factors (gradients in temperature and humidity) influence the size resolved chemical composition of PM transported from outdoors to indoors. 3.) Are there additional chemical and physical changes to particulate matter induced in an occupied versus unoccupied room? It appears that this is the first study to use any type of Aerodyne Aerosol Mass Spectrometer in the indoor environment. Aerosol mass spectrometer instruments are commonly used in atmospheric particulate measurements, but they have not yet been utilized in indoor particulate measurements and research. Pilot study investigations demonstrated the feasibility of this experimental approach and the richness of the data generated. The initial observations show the need for high time resolution and chemical information provided by aerosol mass spectrometry. The full study will make use of the real-time measurements of particulate sulfate, nitrate, ammonium, black carbon and a variety of organics species using both positive matrix factorization and ion markers for specific compounds. It is expected that the results of this study will be an important contribution, unique in the indoor air quality field.

1437916 DeCarlo，Peter F.颗粒物尺寸和成分变化对从室外到室内环境的运输的响应在空气污染领域，当颗粒物从室外运输到室内环境时，对颗粒物成分如何在真实的时间内变化知之甚少。该项目的目标是在线实时表征室外、室内和建筑物内的颗粒化学成分和粒度分布，并具有高时间分辨率（每个位置的采样时间为6分钟，每个位置的采样时间为2分钟）。该研究计划旨在加强室外空气质量和室内空气质量研究之间的合作。这两个学科之间的界限通常是严格的，但正如这里所建议的那样，通过两个团队的合作可以学到很多东西。为了促进这种互动，将召开关于室外和室内空气质量的研讨会，汇集我们地区的研究人员，以确定研究议程，目的是了解室外空气进入室内时发生的变化。所获得的见解将有可能提高我们对室内环境暴露于室外颗粒的风险的理解，这些颗粒被输送到室内环境中，并在过渡期间发生成分变化。最后，费城地区的公共宣传机会很普遍。富兰克林研究所主办的费城科学博览会等活动为PI DeCarlo提供了向公众展示这项工作成果的绝佳机会。利用最近通过NSF MRI资助获得的仪器生成的独特数据集（第1229298号裁决），本研究将探讨温度和湿度梯度对颗粒物化学成分动态分配行为的影响和尺寸分布。这项研究将提出几个问题，例如：1）如何从典型的过程（如昼夜周期，光化学生产，天气事件，季节周期）的变化，室外PM的大小和化学成分的影响室内PM的大小分辨的化学成分？2)环境因素（温度和湿度梯度）的变化如何影响从室外输送到室内的PM的尺寸分辨化学成分。3.）第三章在有人居住的房间和无人居住的房间中，是否有额外的化学和物理变化？ 这似乎是第一次在室内环境中使用任何类型的Aerodyne气溶胶质谱仪的研究。气溶胶质谱仪仪器通常用于大气颗粒物测量，但它们尚未用于室内颗粒物测量和研究。初步研究调查表明，这种实验方法的可行性和丰富的数据产生。初步观测表明，需要高时间分辨率和气溶胶质谱提供的化学信息。完整的研究将利用颗粒硫酸盐，硝酸盐，铵，黑碳和各种有机物的实时测量，使用正矩阵因子分解和特定化合物的离子标记。预计这项研究的结果将是一个重要的贡献，在室内空气质量领域的独特。