ACS ES&T AirPub Date : 2025-07-11DOI: 10.1021/acsestair.5c00164
Anna C. Ziola, John J. Orlando and Paul J. Ziemann*,
{"title":"Effects of an Ether Group on the Mechanism, Products, and Nitrate and Secondary Organic Aerosol Yields for the Reaction of Dioctyl Ether with OH/NOx","authors":"Anna C. Ziola, John J. Orlando and Paul J. Ziemann*, ","doi":"10.1021/acsestair.5c00164","DOIUrl":"https://doi.org/10.1021/acsestair.5c00164","url":null,"abstract":"<p >Products and mechanisms of atmospheric oxidation of volatile organic compounds (VOCs) are complex and depend on the VOC structure, oxidant, and oxidation regime. In addition to alkanes, alkenes, and aromatics, the major classes of hydrocarbons that are emitted to the atmosphere, oxygenated VOCs are also an important component of anthropogenic and biogenic emissions whose reactions can influence the formation of ozone and secondary organic aerosol. In this study, we investigated the effect of an ether group on the OH radical-initiated oxidation of dioctyl ether (DOE), a linear C<sub>16</sub> compound with an ether group located in the center of the carbon chain, under high NO<sub><i>x</i></sub> conditions. Experiments were conducted in an environmental chamber, and gas- and particle-phase products were analyzed using gas and liquid chromatography, electron and chemical ionization mass spectrometry, infrared spectroscopy, and derivatization-spectrophotometry. Nitrate, hydroxynitrate, and hydroxycarbonyl ether products are analogous to those formed from the reaction of the corresponding alkane; however, the dominant product was octyl formate formed exclusively by reactions involving the ether group. Measured product yields were used with structure–activity relationships for OH and alkoxy radical reactions and literature branching ratios for the corresponding alkane reaction to determine the effect of the ether group on the branching ratio for nitrate vs alkoxy radical formation and to develop a simple model that predicted product yields in reasonable agreement with measurements. Compared to the corresponding alkane, the presence of the ether group increases OH reactivity, decreases the nitrate yield, and reduces the SOA yield by enhancing the formation of alkoxy radicals that decompose rather than isomerize to form low-volatility multifunctional products.</p>","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 8","pages":"1793–1804"},"PeriodicalIF":0.0,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144806171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Karla Rojas García, Alicia M. Krueger, Abril D. Montaño Medina, Aida G. Velasco Ortiz, Juan G. Navea and Vicki H. Grassian*,
{"title":"","authors":"Karla Rojas García, Alicia M. Krueger, Abril D. Montaño Medina, Aida G. Velasco Ortiz, Juan G. Navea and Vicki H. Grassian*, ","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 7","pages":"XXX-XXX XXX-XXX"},"PeriodicalIF":0.0,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acsestair.5c00052","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144595076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS ES&T AirPub Date : 2025-07-11DOI: 10.1021/acsestair.5c00144
Amara L. Holder*, Heidi Vreeland, Hayley Brittingham, Sarah Coefield, Beth Hassett-Sipple, Lilli Deckmejian and Benjamin R. Schmidt,
{"title":"Influence of Building Characteristics on Wildfire Smoke Impacts on Indoor Air Quality","authors":"Amara L. Holder*, Heidi Vreeland, Hayley Brittingham, Sarah Coefield, Beth Hassett-Sipple, Lilli Deckmejian and Benjamin R. Schmidt, ","doi":"10.1021/acsestair.5c00144","DOIUrl":"https://doi.org/10.1021/acsestair.5c00144","url":null,"abstract":"<p >Indoor air quality was monitored in a variety of public buildings during the wildfire seasons of 2019 and 2020 in Missoula, MT, to better understand what factors impact smoke infiltration indoors. PurpleAir sensors were used indoors and outdoors to calculate indoor/outdoor (I/O) PM<sub>2.5</sub> ratios that were compared with building characteristics. Wildfire smoke concentrations measured indoors during a 7 day smoke event were always lower than outdoors, but some buildings had up to 4 days of PM<sub>2.5</sub> above 55 μg/m<sup>3</sup>, corresponding to an unhealthy air quality index. Locations with heating, ventilation, and air conditioning (HVAC) systems in excellent condition and with tightly fitting filters had lower I/O ratios than locations with HVACs in poor condition or locations without an HVAC system. On average, I/O ratios were 15% higher during building open hours compared to closed hours, which may have been due to increased HVAC operation and more frequent door opening during open hours. The I/O ratios ranged from 0.29 to 0.97, varying across locations and during different conditions (presence of smoke or cold weather). No single building factor was identified as being most important in reducing indoor PM<sub>2.5</sub>; therefore, indoor PM<sub>2.5</sub> measurements are essential for identifying when additional mitigation measures are needed.</p>","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 8","pages":"1770–1783"},"PeriodicalIF":0.0,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144806145","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ACS ES&T AirPub Date : 2025-07-09DOI: 10.1021/acsestair.5c00117
Rebecca Mesburis, Madison Rutherford, Anne V. Handschy, Douglas A. Day, Melissa A. Morris, Anna C. Ziola, Zhe Peng, Joost A. de Gouw and Jose L. Jimenez*,
{"title":"Mitigation of Indoor Air Pollution from Air Cleaners Using a Catalyst","authors":"Rebecca Mesburis, Madison Rutherford, Anne V. Handschy, Douglas A. Day, Melissa A. Morris, Anna C. Ziola, Zhe Peng, Joost A. de Gouw and Jose L. Jimenez*, ","doi":"10.1021/acsestair.5c00117","DOIUrl":"https://doi.org/10.1021/acsestair.5c00117","url":null,"abstract":"<p >The COVID-19 pandemic highlighted the importance of indoor air quality and the role of airborne transmission in the disease spread. Heightened public awareness led to an increase in the commercialization and use of air cleaners. While several of these devices effectively disinfect the air, some also initiate chemical reactions that can worsen indoor air quality by generating ozone (O<sub>3</sub>) and other harmful air pollutants. Here we demonstrate the use of a MnO<sub><i>x</i></sub>-based catalyst to mitigate both air cleaner-generated and ambient pollution in a university office. We deployed two real-time chemical ionization mass spectrometers alongside a suite of air quality analyzers to measure a wide range of volatile organic compounds (VOCs), other trace gases, and particles. We show the reduction of many indoor pollutants in a combination of real indoor environment and atmospheric chamber experiments, including O<sub>3</sub>, nitrogen oxides, formaldehyde, and other oxidized VOCs. We observed an increase in the concentrations of more reduced VOCs with catalyst use. We demonstrate that over 24 weeks of continuous operation, the clean air delivery rate of the catalyst for O<sub>3</sub> pollution declined linearly by 20%. These findings suggest that employing a dedicated catalyst could reduce indoor air pollution and enhance the human health benefits of air cleaners by minimizing the associated indoor air quality risks.</p><p >This paper reports on the mitigation of ambient and air cleaner-generated indoor air pollution using a dedicated catalyst.</p>","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"2 8","pages":"1694–1703"},"PeriodicalIF":0.0,"publicationDate":"2025-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://pubs.acs.org/doi/pdf/10.1021/acsestair.5c00117","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144807997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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