Search Results - "Marr, L. C."

Simulation of vertical concentration gradient of influenza viruses in dust resuspended by walking by Khare, P., Marr, L. C.

“…Particles are resuspended from the floor by walking and are subject to turbulent transport in the human aerodynamic wake. These processes may generate a…”
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Practical Indicators for Risk of Airborne Transmission in Shared Indoor Environments and Their Application to COVID-19 Outbreaks by Peng, Z, Rojas, A.L. Pineda, Kropff, E, Bahnfleth, W, Buonanno, G, Dancer, S.J, Kurnitski, J, Li, Y, Loomans, M.G.L.C, Marr, L.C, Morawska, L, Nazaroff, W, Noakes, C, Querol, X, Sekhar, C, Tellier, R, Greenhalgh, T, Bourouiba, L, Boerstra, A, Tang, J.W, Miller, S.L, Jimenez, J.L

“…Some infectious diseases, including COVID-19, can undergo airborne transmission. This may happen at close proximity, but as time indoors increases, infections…”
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Characterization of ambient aerosols in Mexico City during the MCMA-2003 campaign with Aerosol Mass Spectrometry: results from the CENICA Supersite by Salcedo, D., Onasch, T. B., Dzepina, K., Canagaratna, M. R., Zhang, Q., Huffman, J. A., DeCarlo, P. F., Jayne, J. T., Mortimer, P., Worsnop, D. R., Kolb, C. E., Johnson, K. S., Zuberi, B., Marr, L. C., Volkamer, R., Molina, L. T., Molina, M. J., Cardenas, B., Bernabé, R. M., Márquez, C., Gaffney, J. S., Marley, N. A., Laskin, A., Shutthanandan, V., Xie, Y., Brune, W., Lesher, R., Shirley, T., Jimenez, J. L.

“…An Aerodyne Aerosol Mass Spectrometer (AMS) was deployed at the CENICA Supersite, during the Mexico City Metropolitan Area field study (MCMA-2003) from 31…”
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Sources and transformations of particle-bound polycyclic aromatic hydrocarbons in Mexico City by Marr, L. C., Dzepina, K., Jimenez, J. L., Reisen, F., Bethel, H. L., Arey, J., Gaffney, J. S., Marley, N. A., Molina, L. T., Molina, M. J.

“…Understanding sources, concentrations, and transformations of polycyclic aromatic hydrocarbons (PAHs) in the atmosphere is important because of their potent…”
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How did we get here: what are droplets and aerosols and how far do they go? A historical perspective on the transmission of respiratory infectious diseases by Randall, K, Ewing, E T, Marr, L C, Jimenez, J L, Bourouiba, L

“…The COVID-19 pandemic has exposed major gaps in our understanding of the transmission of viruses through the air. These gaps slowed recognition of airborne…”
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Application of positive matrix factorization to on-road measurements for source apportionment of diesel- and gasoline-powered vehicle emissions in Mexico City by Thornhill, D. A., Williams, A. E., Onasch, T. B., Wood, E., Herndon, S. C., Kolb, C. E., Knighton, W. B., Zavala, M., Molina, L. T., Marr, L. C.

“…The goal of this research is to quantify diesel- and gasoline-powered motor vehicle emissions within the Mexico City Metropolitan Area (MCMA) using on-road…”
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Evaluation of mobile emissions contributions to Mexico City's emissions inventory using on-road and cross-road emission measurements and ambient data by Zavala, M., Herndon, S. C., Wood, E. C., Onasch, T. B., Knighton, W. B., Marr, L. C., Kolb, C. E., Molina, L. T.

“…Mobile emissions represent a significant fraction of the total anthropogenic emissions burden in the Mexico City Metropolitan Area (MCMA) and, therefore, it is…”
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Characterization of on-road vehicle emissions in the Mexico City Metropolitan Area using a mobile laboratory in chase and fleet average measurement modes during the MCMA-2003 field campaign by Zavala, M., Herndon, S. C., Slott, R. S., Dunlea, E. J., Marr, L. C., Shorter, J. H., Zahniser, M., Knighton, W. B., Rogers, T. M., Kolb, C. E., Molina, L. T., Molina, M. J.

“…A mobile laboratory was used to measure on-road vehicle emission ratios during the MCMA-2003 field campaign held during the spring of 2003 in the Mexico City…”
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Vehicle fleet emissions of black carbon, polycyclic aromatic hydrocarbons, and other pollutants measured by a mobile laboratory in Mexico City by Jiang, M., Marr, L. C., Dunlea, E. J., Herndon, S. C., Jayne, J. T., Kolb, C. E., Knighton, W. B., Rogers, T. M., Zavala, M., Molina, L. T., Molina, M. J.

“…Black carbon (BC) and polycyclic aromatic hydrocarbons (PAHs) are of concern due to their effects on climate and health. The main goal of this research is to…”
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Dismantling myths on the airborne transmission of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) by Tang, J.W., Bahnfleth, W.P., Bluyssen, P.M., Buonanno, G., Jimenez, J.L., Kurnitski, J., Li, Y., Miller, S., Sekhar, C., Morawska, L., Marr, L.C., Melikov, A.K., Nazaroff, W.W., Nielsen, P.V., Tellier, R., Wargocki, P., Dancer, S.J.

“…The coronavirus disease 2019 (COVID-19) pandemic has caused untold disruption throughout the world. Understanding the mechanisms for transmission of severe…”
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Can indoor sports centers be allowed to re-open during the COVID-19 pandemic based on a certificate of equivalence? by Blocken, B., van Druenen, T., van Hooff, T., Verstappen, P.A., Marchal, T., Marr, L.C.

“…Within a time span of only a few months, the SARS-CoV-2 virus has managed to spread across the world. This virus can spread by close contact, which includes…”
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Influence of advection on measurements of the net ecosystem-atmosphere exchange of CO2 from a very tall tower by Yi, C., Davis, K. J., Bakwin, P. S., Berger, B. W., Marr, L. C.

“…In most studies of the net ecosystem‐atmosphere exchange of CO2 (NEE) using tower‐based eddy covariance (EC) systems it has been assumed that advection is…”
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Characterization of Polycyclic Aromatic Hydrocarbons in Motor Vehicle Fuels and Exhaust Emissions by Marr, Linsey C, Kirchstetter, Thomas W, Harley, Robert A, Miguel, Antonio H, Hering, Susanne V, Hammond, S. Katharine

“…Motor vehicles are a significant source of polycyclic aromatic hydrocarbon (PAH) emissions. Improved understanding of the relationship between fuel composition…”
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Aerosols should not be defined by distance travelled by Tang, J.W., Marr, L.C., Milton, D.K.

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Spatial and temporal variability of particulate polycyclic aromatic hydrocarbons in Mexico City by Thornhill, D. A., de Foy, B., Herndon, S. C., Onasch, T. B., Wood, E. C., Zavala, M., Molina, L. T., Gaffney, J. S., Marley, N. A., Marr, L. C.

“…As part of the Megacities Initiative: Local and Global Research Observations (MILAGRO) study in the Mexico City Metropolitan Area in March 2006, we measured…”
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Putting a balance on the aerosolization debate around SARS-CoV-2 by Dancer, S.J., Tang, J.W., Marr, L.C., Miller, S., Morawska, L., Jimenez, J.L.

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Size and mineral composition of airborne particles generated by an ultrasonic humidifier by Sain, A. E., Zook, J., Davy, B. M., Marr, L. C., Dietrich, A. M.

“…This study describes the size distribution and concentration of particles expelled by a portable, 3‐L ultrasonic humidifier. The ultrasonic humidifier was…”
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A simple method to measure the gas-phase SVOC concentration adjacent to a material surface by Wu, Y., Xie, M., Cox, S. S., Marr, L. C., Little, J. C.

“…Assessing human exposure to semivolatile organic compounds (SVOCs) emitted from materials and products is difficult because methods are not available to easily…”
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Changes in Motor Vehicle Emissions on Diurnal to Decadal Time Scales and Effects on Atmospheric Composition by Harley, Robert A, Marr, Linsey C, Lehner, Jaime K, Giddings, Sarah N

“…Emissions from gasoline and diesel engines vary on time scales including diurnal, weekly, and decadal. Temporal patterns differ for these two engine types that…”
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Spectral analysis of weekday–weekend differences in ambient ozone, nitrogen oxide, and non-methane hydrocarbon time series in California by Marr, Linsey C., Harley, Robert A.

“…We describe the history and spatial distribution of day-of-week differences in ambient ozone, NO x , and VOC concentrations through the analysis of two decades…”
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