ACS ES&T Air最新文献

Constraints on the Loss of Hydroperoxymethyl Thioformate (HPMTF) to Marine Clouds Using Aircraft Observations 利用飞机观测对氢过氧甲基硫代甲酸（HPMTF）向海洋云损失的限制

ACS ES&T Air Pub Date : 2026-10-09 Epub Date: 2026-09-28 DOI: 10.1021/acsestair.6c00199

Christopher M. Jernigan, Gordon A. Novak, Siyuan Wang, Michael A. Robinson, Adam Ahern, Osinachi Ajoku, Katherine Ball, Timothy H. Bertram, Kelvin H. Bates, Birger Bohn, Charles A. Brock, Wyndom S. Chace, Matthew Coggon, Maximilian Dollner, Michelle Färber, Zachary Finewax, Hendrik Fuchs, Georgios I. Gkatzelis, Han Huynh, Jan Kazil, Ming Lyu, Anna Novelli, Jeff Peischl, Andrew Rollins, Nell B. Schafer, Aaron Stainsby, Chelsea E. Stockwell, Patrick R. Veres, Carsten Warneke, Eleanor Waxman, Bernadett Weinzierl, Kevin Wokosin, Lu Xu, Kristen Zuraski, Steven S. Brown

{"title":"Constraints on the Loss of Hydroperoxymethyl Thioformate (HPMTF) to Marine Clouds Using Aircraft Observations","authors":"Christopher M. Jernigan, Gordon A. Novak, Siyuan Wang, Michael A. Robinson, Adam Ahern, Osinachi Ajoku, Katherine Ball, Timothy H. Bertram, Kelvin H. Bates, Birger Bohn, Charles A. Brock, Wyndom S. Chace, Matthew Coggon, Maximilian Dollner, Michelle Färber, Zachary Finewax, Hendrik Fuchs, Georgios I. Gkatzelis, Han Huynh, Jan Kazil, Ming Lyu, Anna Novelli, Jeff Peischl, Andrew Rollins, Nell B. Schafer, Aaron Stainsby, Chelsea E. Stockwell, Patrick R. Veres, Carsten Warneke, Eleanor Waxman, Bernadett Weinzierl, Kevin Wokosin, Lu Xu, Kristen Zuraski, Steven S. Brown","doi":"10.1021/acsestair.6c00199","DOIUrl":"https://doi.org/10.1021/acsestair.6c00199","url":null,"abstract":"The photochemicaloxidation of dimethyl sulfide (DMS) by the hydroxylradical (OH) contributes to the production and growth of particlesand cloud condensation nuclei in the marine boundary layer (MBL).DMS oxidized by OH can go on to form a stable intermediate, hydroperoxymethylthioformate (HPMTF), which is both globally ubiquitous and efficientlylost to multiphase processes in the marine atmosphere. Recent workhas shown that clouds act as a significant and irreversible loss pathfor HPMTF, sequestering sulfur and greatly reducing the productionof long-lived, climate-relevant species (e.g., SO2 andOCS). Until recently, there have been few observational constraintson the role of clouds in the spatiotemporal distribution of HPMTFand other soluble molecules in the MBL. Using a steady-state approximation,we determine a reactive uptake and first-order aqueous loss rate constantof HPMTF to cloud droplets of 1.2 (0.9–1.9) × 10–2 and 1.4 (0.4–2.2) × 10–1 s–1, respectively. The results suggest that hydrolysis and ozonolysisare significant within cloud droplets, and their competition likelyimpacts the distribution of sulfate and organic acids in the marineenvironment.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"3 10","pages":"2699–2709"},"PeriodicalIF":0.0,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149152943","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}

引用次数: 0

Photochemical Modeling of Wintertime HOx Sources and Sinks in a Subarctic Urban Location 亚北极城市地区冬季HOx源和汇的光化学模拟

ACS ES&T Air Pub Date : 2026-10-09 Epub Date: 2026-09-12 DOI: 10.1021/acsestair.6c00254

Alicia Hoffman, Rachel L. James, Dwayne E. Heard, Lisa Whalley, Daniel Stone, Samuel Seldon, Jochen Stutz, Jonas Kuhn, Sol Cooperdock, Brice Temime-Roussel, Amna Ijaz, Barbara D’Anna, Kathy S. Law, Slimane Bekki, Fangzhou Guo, James Flynn, James M. St Clair, Meeta Cesler-Maloney, William R. Simpson, Steve R. Arnold

{"title":"Photochemical Modeling of Wintertime HOx Sources and Sinks in a Subarctic Urban Location","authors":"Alicia Hoffman, Rachel L. James, Dwayne E. Heard, Lisa Whalley, Daniel Stone, Samuel Seldon, Jochen Stutz, Jonas Kuhn, Sol Cooperdock, Brice Temime-Roussel, Amna Ijaz, Barbara D’Anna, Kathy S. Law, Slimane Bekki, Fangzhou Guo, James Flynn, James M. St Clair, Meeta Cesler-Maloney, William R. Simpson, Steve R. Arnold","doi":"10.1021/acsestair.6c00254","DOIUrl":"https://doi.org/10.1021/acsestair.6c00254","url":null,"abstract":"The hydroxyl radical(OH) is a key atmospheric oxidantthat isimportant for regulating pollutant concentrations and particle formationand composition. The globally dominant formation mechanism of OH isozone photolysis. However, the low-light conditions in the wintertimeArctic may limit OH formation through this pathway, and there is alack of observations available to explain oxidant chemistry in polarlocations. We use the Dynamically Simple Model of Atmospheric ChemicalComplexity (DSMACC) 0D model to assess processes controlling the abundancesof atmospheric oxidants in a subarctic city. To constrain the model,we use measurements made during the Alaskan Layered Pollution andChemical Analysis (ALPACA) field campaign, which took place in Fairbanks,Alaska, USA, during the winter of 2022. HONO photolysis to form OHis the major chemical source of HOx inthe polluted, low-light environment of wintertime Fairbanks, and formaldehydeis an important precursor for HO2. We find that the HOx budget is distinct between a polluted, stronglystable inversion event and a clean, weakly stable period because ofthe different meteorology and pollution levels regulating peroxynitricacid (PNA, HO2NO2) cycling. Our results improveour understanding of the unique atmospheric pollution chemistry undercold and low-light conditions.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"3 10","pages":"2827–2842"},"PeriodicalIF":0.0,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149152918","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}

引用次数: 0

ACS ES&T Air 2025 Excellence in Review Awards ACS ES&T Air 2025卓越评审奖

ACS ES&T Air Pub Date : 2026-10-09 DOI: 10.1021/acsestair.6c00410

Nga L. Ng, Timothy Bertram, Roisin Commane, Margaret Mills, Rachel O’Brien, Ilona Riipinen, Likun Xue

引用次数: 0

A Performance Evaluation Framework for Continuous Methane Monitoring: Effects of Event Association and Metric Choice 连续甲烷监测的性能评估框架：事件关联和度量选择的影响

ACS ES&T Air Pub Date : 2026-10-09 Epub Date: 2026-09-02 DOI: 10.1021/acsestair.6c00276

Ziliang Mao, Penggang Zheng, Bo Fu, Shan Zhou

{"title":"A Performance Evaluation Framework for Continuous Methane Monitoring: Effects of Event Association and Metric Choice","authors":"Ziliang Mao, Penggang Zheng, Bo Fu, Shan Zhou","doi":"10.1021/acsestair.6c00276","DOIUrl":"https://doi.org/10.1021/acsestair.6c00276","url":null,"abstract":"Continuous monitoring (CM) methane leak detection andquantification(LDAQ) systems provide high-time-resolution information on intermittentand persistent emissions, but the reported performance of these systemsdepends on how their outputs are evaluated. Reported detection eventsmust first be associated with actual emission events before detectionclassification, detection limit, localization accuracy, and quantificationerror can be interpreted. Here, we develop and apply a performanceevaluation framework for CM methane LDAQ systems using a three-monthsingle-blind controlled-release dataset. The framework defines rulesfor temporal association, spatial association, concurrent emissions,and excess reported detections, and introduces complementary event-levelmetrics for quantification agreement, reporting frequency, temporalprecision, temporal coverage, and start-time identification. We comparedthe resulting performance interpretation with two existing protocolswhen applicable. For the same actual emission and reported detectionevents, different event association rules change true positive (TP),false positive, and false negative classifications, leading to different90% detection limit values. Quantification interpretation also dependson metric choice: mean relative error can suggest overestimation evenwhen most individual TP events are underestimated, whereas the boundedQ metric provides a complementary fold-error summary. Event-levelmetrics further show that TP events differ in temporal coverage andstart-time identification. These results demonstrate that CM performanceshould be interpreted together with the evaluation rules and metricdefinitions.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"3 10","pages":"2859–2870"},"PeriodicalIF":0.0,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149152901","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}

引用次数: 0

Multiscale Modeling of Ozone Formation and Chemical Regimes in Arizona during the North American Monsoon 北美季风期间亚利桑那州臭氧形成和化学机制的多尺度模拟

ACS ES&T Air Pub Date : 2026-10-09 Epub Date: 2026-09-14 DOI: 10.1021/acsestair.6c00170

Mohammad Amin Mirrezaei, Wenfu Tang, Benjamin Gaubert, Yafang Guo, Louisa K. Emmons, Armin Sorooshian, Avelino F. Arellano

{"title":"Multiscale Modeling of Ozone Formation and Chemical Regimes in Arizona during the North American Monsoon","authors":"Mohammad Amin Mirrezaei, Wenfu Tang, Benjamin Gaubert, Yafang Guo, Louisa K. Emmons, Armin Sorooshian, Avelino F. Arellano","doi":"10.1021/acsestair.6c00170","DOIUrl":"https://doi.org/10.1021/acsestair.6c00170","url":null,"abstract":"Ground-level ozone (O3) remains a persistentair-qualitychallenge in the Southwest U.S. desert, including Arizona, despitenationwide emission reductions. Here, we apply the variable-resolutionglobal chemistry–climate model MUSICAv0 to investigate O3 formation, transport, and chemical regime variability acrossPhoenix, Tucson, Yuma, and surrounding rural regions during July 2020monsoon-onset conditions. Model performance is evaluated against surfaceobservations, satellite retrievals, and regional WRF-Chem simulations.MUSICAv0 captures the observed diurnal variability of O3 and its precursors across all regions, with generally good agreementin Tucson, Yuma, and rural sites. However, a persistent afternoonoverestimation is evident in Phoenix. The updated MOZART-TS2 chemistryreduces the Phoenix MDA8 bias, while budget analysis shows that theremaining bias cannot be explained by chemistry alone and reflectscombined transport, deposition, and boundary-layer influences. Chemicalregime diagnostics indicate that Phoenix exhibits more VOC-sensitivechemistry with shifts toward transition conditions during high-O3 events, Tucson operates largely within a transition regime,and Yuma and rural regions remain predominantly NOx-limited. These findings demonstrate that for the July 2020monsoon-onset conditions, variable-resolution global models providea unified framework for diagnosing chemical regime sensitivity, modelbiases, and their interaction with transport processes in arid urbanenvironments, supporting future O3 mitigation strategiesthat integrate updated emissions, high-resolution satellite observations,and field campaign constraints.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"3 10","pages":"2654–2669"},"PeriodicalIF":0.0,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149152904","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}

引用次数: 0

Plastic-Derived Organic Aerosols in the Atmosphere: Beyond Micro- and Nanoplastics 大气中塑料衍生的有机气溶胶：超越微塑料和纳米塑料

ACS ES&T Air Pub Date : 2026-10-09 Epub Date: 2026-09-08 DOI: 10.1021/acsestair.6c00309

Alexander Laskin

引用次数: 0

Simulations of SOA Oxidative Potentials Using Explicitly Predicted Products Formed from Atmospheric Processes of Various Hydrocarbons 利用各种碳氢化合物在大气过程中形成的明确预测产物模拟SOA氧化电位

ACS ES&T Air Pub Date : 2026-10-09 Epub Date: 2026-09-07 DOI: 10.1021/acsestair.6c00098

Anthony Chung, Myoseon Jang

{"title":"Simulations of SOA Oxidative Potentials Using Explicitly Predicted Products Formed from Atmospheric Processes of Various Hydrocarbons","authors":"Anthony Chung, Myoseon Jang","doi":"10.1021/acsestair.6c00098","DOIUrl":"https://doi.org/10.1021/acsestair.6c00098","url":null,"abstract":"Reactive oxygen species (ROS) in secondary organic aerosol(SOA)cause oxidative stress in airway cells and harm respiratory health.The UNIfied Partitioning Aerosol Reaction (UNIPAR) model predictingSOA formation by multiphase reactions of hydrocarbons was appliedto estimate the oxidative potential (OP) of SOA generated from thephotooxidation of phenol, naphthalene, toluene, and α-pinene.In the UNIPAR-OP model, SOA chemical compositions, predicted withlumping species using explicitly predicted products, were enabledto estimate ROS, including hydroperoxides (ROOH), conjugated carbonyls(CJCB), peroxyacyl nitrates (PAN), and naphthoquinones (QUINONE) undervarying environments. The performance of UNIPAR-OP was evaluated bycomparing simulations with data from chemical assays (dithiothreitolassay for OP and 4-nitrophenylboronic acid assay for ROOH). Both predictionsand observations revealed that SOA OP is more sensitive to hydrocarbontype than NOx levels showing the highestOP with naphthalene SOA and the lowest with α-pinene. The dominanceof subgroup ROS in OP varies by SOA, with CJCB significant in phenoland toluene SOA, QUINONE in naphthalene SOA, and ROOH and PAN in α-pineneSOA. UNIPAR-OP can predict regional differences in OP under varyingSOA compositions and NOx levels, withquantification of subgroup contributions and identification of SOAcomponents that are associated with OP.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"3 10","pages":"2549–2561"},"PeriodicalIF":0.0,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149153116","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}

引用次数: 0

Air Quality during and after the 2025 Los Angeles, California Fires and the Utility of Potassium as a Fire Tracer 2025年洛杉矶、加利福尼亚大火期间和之后的空气质量以及钾作为火灾示踪剂的效用

ACS ES&T Air Pub Date : 2026-10-09 Epub Date: 2026-09-15 DOI: 10.1021/acsestair.6c00085

Catherine A. Banach, Kyle Caulson, Laura H. Thapa, Pablo E. Saide, Suzanne E. Paulson

{"title":"Air Quality during and after the 2025 Los Angeles, California Fires and the Utility of Potassium as a Fire Tracer","authors":"Catherine A. Banach, Kyle Caulson, Laura H. Thapa, Pablo E. Saide, Suzanne E. Paulson","doi":"10.1021/acsestair.6c00085","DOIUrl":"https://doi.org/10.1021/acsestair.6c00085","url":null,"abstract":"Wildland–urban interface fires are becoming morefrequent,and their impacts on adjacent urban centers are increasing. In January2025, the Eaton and Palisades fires burned over 18,000 structuresand 15,000 hectares of urban and wildlands and blanketed parts ofSouthern California, USA, in smoke and dust. Here, we combine hourlyand multihour metals, particulate matter, and gas data from two siteswith meteorological and fire spatial extent data and several statisticalmethods to understand the fire impacts on air quality. The primaryreceptor site, in Huntington Park, about 28 km from the Eaton fire,was intermittently directly downwind. The smoke increased airbornelead concentrations by up to 250 times its background, to about 0.2%of PM2.5 mass; arsenic, chlorine, bromine, and copper werealso highly elevated. Concentrations of elements associated with resuspendedsoil began to rise when high winds started immediately prior to fireignition and decayed once the winds decreased. Potassium, often usedas a biomass-burning tracer, was uncorrelated with smoke. It was stronglyassociated with coarse particles, and its mass-normalized concentrationfell within its normal range during the fires, indicating that potassiumcannot be used as a fire tracer in this context. Lead was elevatedin smoke throughout the fire, thus, its concentration could not beused to determine urban versus wildland combustion within this WUIfire event. There was no clear tracer of urban vs wildland burningin the smoke or coarse particles. Finally, we found little evidenceof fire-associated pollution after the fires had been extinguished.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"3 10","pages":"2526–2537"},"PeriodicalIF":0.0,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149152849","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}

引用次数: 0

Tracking Oxidized Volatile Methyl Siloxanes in New York City in Summertime 纽约市夏季氧化挥发性甲基硅氧烷的追踪

ACS ES&T Air Pub Date : 2026-10-09 Epub Date: 2026-09-03 DOI: 10.1021/acsestair.6c00134

Jeewani N. Meepage, Josie K. Welker, Christopher E. Brunet, Charles O. Stanier, Elizabeth A. Stone

{"title":"Tracking Oxidized Volatile Methyl Siloxanes in New York City in Summertime","authors":"Jeewani N. Meepage, Josie K. Welker, Christopher E. Brunet, Charles O. Stanier, Elizabeth A. Stone","doi":"10.1021/acsestair.6c00134","DOIUrl":"https://doi.org/10.1021/acsestair.6c00134","url":null,"abstract":"Volatile methyl siloxanes (VMS) are high-production anthropogenicchemicals that can undergo atmospheric oxidation to form oxidizedVMS (oVMS) in the atmosphere and contribute to secondary organic aerosol(SOA). Herein, we develop an SOA tracer-based approach to estimateoVMS contributions to ambient fine particulate matter (PM2.5) organic carbon (OC) in New York City (NYC). oVMS including a seriesof siloxanols with intact D4, D5, and D6 rings were identified and semiquantified in field and laboratorychamber aerosol samples by liquid chromatography–tandem massspectrometry. oVMS were persistent in PM2.5 in NYC duringsummertime, with oVMS from D4 and D6 showingmore atmospheric aging than D5. Statistically significantcorrelations among these oVMS suggest common atmospheric formationpathways. Daytime concentrations of oVMS were significantly higherthan nighttime levels consistent with a photochemical source. In PM2.5, the most prominent oVMS signal was the disiloxanol whichpartitioned primarily to the particle phase (averaging 77%). Usingthe tracer-based approach, D4, D5, and D6-derived SOA was estimated to contribute 14 ± 5 ng m–3 to PM2.5 corresponding to ∼0.10%of PM2.5 organic carbon, making VMS oxidation a minor sourceof PM2.5 in NYC.","PeriodicalId":100014,"journal":{"name":"ACS ES&T Air","volume":"3 10","pages":"2591–2603"},"PeriodicalIF":0.0,"publicationDate":"2026-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149152837","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}

引用次数: 0

Correction to “A Network Calibration Approach Improves the Accuracy and Long-Term Stability of a Low-Cost Air Quality Mesonet in New York City” 修正“网络校准方法提高纽约市低成本空气质量Mesonet的准确性和长期稳定性”

ACS ES&T Air Pub Date : 2026-10-09 Epub Date: 2026-09-28 DOI: 10.1021/acsestair.6c00297

Ellie H. Hojeily, Jason M. Covert, Margaret J. Schwab, Clover Moore, Cheng-Hsuan Lu, Md. Aynul Bari, Scott D. Miller

引用次数: 0