A Planar Mixing Layer (PML) Configuration to Perform Spatially Resolved High-Resolution Differential Mobility Analysis (HR-DMA) in Diffusion Flames. Mahmoud Ashour, FARNAZ KHOSRAVI, Francesco Carbone, University of Connecticut.

Airborne Per- and Polyfluoroalkyl Substances (PFAS) in North Carolina Firehouses. GABRIELLE WEST, Clara Eichler, Naomi Chang, Rebecca Turner, Barbara Turpin, Jason Surratt, University of North Carolina at Chapel Hill.

Analysis of Significant Weather Events (Inversion, Dust, Wildfire Smoke) Impact on Indoor and Outdoor PM2.5 Levels Measured Using a Network of Low-Cost Air Quality Sensors. TRISTALEE MANGIN, Zachary Palmer, Darrah Sleeth, Kerry Kelly, University of Utah.

Assessing Ambient Air Quality Response to Cookstove Intervention. KY TANNER, John Volckens, Colorado State University.

Automated Tandem Aerosol Classifier Experiments. JULIE PONGETTI, Timothy Sipkens, Morteza Kiasadegh, Jason S. Olfert, Jonathan Symonds, Cambustion Ltd.

Characterizing the Long-Term Performance of Four Corsi-Rosenthal Boxes. GRAHAM JAEGER, Theresa Pistochini, Richard Corsi, Christopher Cappa, University of California, Davis.

Chemical Composition of PM2.5 in Metropolitan Cities of India: Results from an Extensive Winter Campaign. PRINCE VIJAY, Shreya Dubey, Nidhi Singh, Tamara Schikowski, Harish C Phuleria, Indian Institute of Technology Bombay.

Combining Low-cost Air Quality Sensors with a Micronet for Fine-scale Monitoring in NYC. Ellie Hojeily, JANIE SCHWAB, Jason Covert, Kit Moore, Matthew Brooking, Sarah Lu, Md. Aynul Bari, Scott Miller, University at Albany, SUNY.

Comparison of PM2.5 Measurements by Air Quality Monitoring Stations and Filter-based Method in Jakarta, Indonesia. ENDAH DAMASTUTI, Muhayatun Santoso, Desie Khoeratunnisya, Syukria Kurniawati, Djoko Prakoso Dwi Atmodjo, Faizal Ramadhani, Woro Yatu Niken Syahfitri, Feni Fernita Nurhaini, Philip K. Hopke, National Innovation and Research Agency (BRIN), Indonesia.

Development of a Low-Cost, Open Source Condensation Particle Counter (CPC). AARON COLLINS, OpenAeros LLC.

Do-It-Yourself Air Cleaners as an Emergency Measure to Reduce Indoor Exposure to Respiratory Aerosols. WILLIAM LINDSLEY, Raymond Derk, Jayme Coyle, Francoise Blachere, Stephen Martin, Jr., Kenneth R. Mead, Donald Beezhold, John Noti, National Institute for Occupational Safety and Health.

Effect of the Uncertainty in Density of Polystyrene Latex (PSL) Spheres on the Calibration of Aerosol Instruments. JULIE PONGETTI, Chris Nickolaus, Jonathan Symonds, Cambustion Ltd.

Evaluation of Regional-Scale Model Parameters in the Prediction of Isoprene Epoxydiol (IEPOX)-Derived Secondary Organic Aerosols (SOA) Generated during Laboratory Chamber Experiments. ALEXANDRA NG, Yuzhi Chen, Jaime Green, Jason Surratt, Haofei Zhang, William Vizuete, University of North Carolina at Chapel Hill.

Evaluation of the Effectiveness of a Hygroscopic Glycerol Coating on MCE Filters on the Conservation of MS2 Viability during Aerosol Sampling. MO WASHEEM, William Vass, Sripriya Nannu Shankar, Yuetong Zhang, Amin Shirkhani, Morteza Alipanah, Z. Hugh Fan, John Lednicky, Chang Yu Wu, University of Florida, Gainesville.

Evaluation of Uncertainties and Introduction of Tools for Quantification of Bulk Particle-phase Organic Nitrates Using Real-time Aerosol Mass Spectrometry. DOUGLAS A. DAY, Benjamin A. Nault, Pedro Campuzano-Jost, Jose-Luis Jimenez, CIRES, University of Colorado, Boulder.

Exploring the Phase Behavior of Biomass Burning Aerosols. NEALAN GERREBOS, F.K.A. Gregson, Julia Zaks, Allan K. Bertram, University of British Columbia.

Fusing Surface Monitors, Satellites and Forecasts for Near-real-time Air Quality. BARRON HENDERSON, Pawan Gupta, Shobha Kondragunta, Phil Dickerson, Alqamah Sayeed, Hai Zhang, EPA.

High-Resolution Differential Mobility Analysis (HR-DMA) of Nickel Oxide Nanoparticles Synthesized in Flat Premixed Droplet Seeded Flame (FPDSF). Farnaz Khosravi, Owen Fuhr, Dylan Errico, Mahmoud Ashour, Christian Bjork, FRANCESCO CARBONE, University of Connecticut.

High-Resolution Differential Mobility Analysis (HR-DMA) of sub-10nm Nanoparticles Synthesized by the Reactive Spray Deposition Technology. FARNAZ KHOSRAVI, Evangelos K. Stefanidis, Zhiqiao Zeng, Stoyan Bliznakov, Leonard J. Bonville, Radenka Maric, Francesco Carbone, University of Connecticut.

Improved Biomass Stoves and and Improved Cooking Practices Contribute to Lowering PM2.5 Exposure in Addis Ababa, Ethiopia. Margaret Hall, Sophie McManus, Amadou Toure, Audrey Parrott, Ella Hein, Alek Rabago, Nora Caballero, Austin Heuer, Seblua Abebe, Tsegaye Nega, DEBORAH GROSS, Carleton College.

Improving Residential Wood Combustion Emissions Factors and Chemical Speciation with the Reactive Organic Carbon Framework. BENJAMIN MURPHY, Karl Seltzer, Amara Holder, Gabriel Isaacman-VanWertz, Havala Pye, United States Environmental Protection Agency.

Intercomparison of Instrumental Methods Using Model II Regression. COLLEEN MARCIEL ROSALES, Nicholas E. Brunk, Nicole Hyslop, Nicholas Spada, University of California, Davis.

Investigating Efficient Flight Pathways with Continuous and Discrete Sampling for UAV-based Greenhouse Gas Monitoring at Environmental Infrastructures. HORIM KIM, Keun Taek Kim, Hyeri Jo, Minyong Yang, Young Su Lee, Sangjae Jeong, Jae Young Kim, Seoul National University.

Investigating the Impact of Emission Reductions on Ambient PAH and Nitrated PAH Concentrations. JUN MENG, Elisabeth Galarneau, Deyong Wen, Junhua Zhang, Kenjiro Toyota, Verica Savic-Jovcic, Environment and Climate Change Canada.

Mapping the Performance of a Versatile Water-based Condensation Particle Counter (vWCPC) with COMSOL Simulation and Experimental Study. WEIXING HAO, Fan Mei, Susanne Hering, Steven Spielman, Beat Schmid, Jason Tomlinson, Yang Wang, University of Miami.

Measuring Black Carbon Particles in Human Placentae. PHILIP K. HOPKE, Atsuo Chiu, Verda Thomas, Emma Norris, Richard Miller, University of Rochester School of Medicine and Dentistry.

N95 Respirators Provide Superior Source Control for SARS-CoV-2. JIANYU LAI, Kristen K. Coleman, Sheldon Tai, Jennifer German, Filbert Hong, Barbara J. Albert, Yi Esparza, Aditya Kiran Srikakulapu, Petri Kalliomäki, Maria Schanz, Isabel Sierra Maldonado, Molly Oertel, Naja Fadul, Louie Gold, Kathleen McPhaul, Tianzhou Ma, Benjamin Cowling, Donald K. Milton, School of Public Health, University of Maryland, College Pk.

OpenAQ: Providing Universal Access to Air Quality Data to Empower a Global Community of Changemakers in Solving Air Inequality. COLLEEN MARCIEL ROSALES, Chris Hagerbaumer, Russ Biggs, Gabriel Fosse, OpenAQ.

Photochemical Production of Light-absorbing Syringol Secondary Organic Aerosol in Droplets using an Atmospheric Simulation Chamber. LELIA HAWKINS, Ellie Smith, Linden Conrad, Jacob Weber, David De Haan, Christian Carmona, Duncan Ugland, Matthew-Khoa Tran, Jean-François Doussin, Mathieu Cazaunau, Aline Gratien, Michael R. Giordano, Mikael Ehn, Frans Graeffe, Liine Heikkinen, Peter F. DeCarlo, Matthieu Riva, Mario Contin, Harvey Mudd College.

PM2.5 Source Changes for 2010-2019 in New York and New Jersey by Dispersion Normalized PMF. Yunle Chen, David Q. Rich, PHILIP K. HOPKE, University of Rochester.

PM2.5 Suppression of Ozone Formation at High Mass Loading. JAMES SCHWAB, Jie Zhang, Alexandra Catena, Janie Schwab, Matthew Ninneman, Junfeng Wang, Amanda Teora, Atmospheric Sciences Research Center, University at Albany.

Practical Characterization and Modeling of Higher Flow in a Water Condensation Growth Tube Bioaerosol Sampler. Dominick Heskett, BRADEN STUMP, Patricia Keady, Gregory S. Lewis, Arantzazu Eiguren-Fernandez, Aerosol Devices Inc..

Predicting Real Refractive Index of Organic Aerosols from Elemental Composition. YAOWEI LI, Bin Bai, John Dykema, Nara Shin, Andrew Lambe, Qi Chen, Mikinori Kuwata, Nga Lee Ng, Frank Keutsch, Pengfei Liu, Harvard University.

Quantifying the Impact of Agricultural Ammonia Increases on Particulate Matter Burden over the Midwestern United States. TOAN VO, Amy Christiansen, University of Missouri - Kansas City.

Real-Time Measurement of Aerosol Size Distributions with the Fast Integrated Mobility Spectrometer (FIMS). DAISY WANG, Jiaoshi Zhang, Jeremy Buhler, Jian Wang, Washington University in St. Louis.

Separation of Aerosols by Localized Vapor Condensation. PAOLO TRONVILLE, María José Rubio, Jesús Marval, Juan Vallejo, Politecnico di Torino.

Soot Size Distribution & Structure during Enclosed Spray Combustion of Jet Fuel. UNA TRIVANOVIC, Georgios A. Kelesidis, Sotiris Pratsinis, ETH Zurich, Switzerland.

The Impact of Inelastic Collisions on the Mean Free Path in Air. DIMITRIOS TSALIKIS, Vlasis Mavrantzas, Sotiris Pratsinis, ETH Zurich, Switzerland.

The Results of SAIL-Net: Investigating Spatial Variability of Aerosol and Cloud Nuclei in Mountainous Terrain. LEAH GIBSON, Ethan Emerson, Nicholas Good, Anna Hodshire, Ezra Levin, Gavin McMeeking, Kate Patterson, Bryan Rainwater, Tom Ramin, Benjamin Swanson, Handix Scientific.

Wearable Air Curtains as Advanced Personal Respiratory Protection. Samuel Sugarman, E.L. Pfeiffer, HEREK CLACK, Taza Aya, Inc..