Search Results - "Hannigan, M. P."

Contrast and correlations between coarse and fine particulate matter in the United States by Li, R., Wiedinmyer, C., Hannigan, M.P.

“…The characteristics of concentrations of PM10–2.5, PM2.5, and PM10 at 77 sites in the United States are evaluated. PM10 concentrations show strong spatial…”
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Positive matrix factorization of PM2.5 - eliminating the effects of gas/particle partitioning of semivolatile organic compounds by Xie, M, Barsanti, K C, Hannigan, M P, Dutton, S J, Vedal, S

“…Gas-phase concentrations of semi-volatile organic compounds (SVOCs) were calculated from gas/particle (G/P) partitioning theory using their measured…”
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Characterization of coarse particulate matter in the western United States: a comparison between observation and modeling by Li, R, Wiedinmyer, C, Baker, K. R, Hannigan, M. P

“…We provide a regional characterization of coarse particulate matter (PM10–2.5) spanning the western United States based on the analysis of measurements from 50…”
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Development and validation of inexpensive, automated, dynamic flux chambers by Almand-Hunter, B. B, Walker, J. T, Masson, N. P, Hafford, L, Hannigan, M. P

“…We developed and validated an automated, inexpensive, and continuous multiple-species gas-flux monitoring system that can provide data for a variety of…”
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The Denver Aerosol Sources and Health (DASH) study: Overview and early findings by Vedal, S., Hannigan, M.P., Dutton, S.J., Miller, S.L., Milford, J.B., Rabinovitch, N., Kim, S.-Y., Sheppard, L.

“…Improved understanding of the sources of air pollution that are most harmful could aid in developing more effective measures for protecting human health. The…”
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Natural soiling of photovoltaic cover plates and the impact on transmission by Boyle, L., Flinchpaugh, H., Hannigan, M.P.

“…Photovoltaic (PV) and other solar energy systems are known to lose efficiency as a result of the accumulation of dust on the surface of the panels. These…”
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Assessing positive matrix factorization model fit: a new method to estimate uncertainty and bias in factor contributions at the measurement time scale by Hemann, J. G., Brinkman, G. L., Dutton, S. J., Hannigan, M. P., Milford, J. B., Miller, S. L.

“…A Positive Matrix Factorization receptor model for aerosol pollution source apportionment was fit to a synthetic dataset simulating one year of daily…”
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Trends in Fine Particle Concentration and Chemical Composition in Southern California by Christoforou, Christos S., Salmon, Lynn G., Hannigan, Michael P., Solomon, Paul A., Cass, Glen R.

“…Airborne fine particle mass concentrations in Southern California have declined in recent years. Trends in sulfate and elemental carbon (EC) particle…”
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Bioassay-Directed Chemical Analysis of Los Angeles Airborne Particulate Matter Using a Human Cell Mutagenicity Assay by Hannigan, Michael P, Cass, Glen R, Penman, Bruce W, Crespi, Charles L, Lafleur, Arthur L, Busby, William F, Thilly, William G, Simoneit, Bernd R. T

“…The human cell mutagenicity of Los Angeles airborne fine particulate matter is examined via bioassay-directed chemical analysis. A 1993 composite fine particle…”
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Positive matrix factorization of PM 2.5 - eliminating the effects of gas/particle partitioning of semivolatile organic compounds by Xie, M, Barsanti, K C, Hannigan, M P, Dutton, S J, Vedal, S

“…Gas-phase concentrations of semi-volatile organic compounds (SVOCs) were calculated from gas/particle (G/P) partitioning theory using their measured…”
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Characterization of organic aerosol in Big Bend National Park, Texas by Brown, Steven G, Herckes, Pierre, Ashbaugh, Lowell, Hannigan, Michael P, Kreidenweis, Sonia M, Collett Jr, Jeffrey L

“…The Big Bend Regional Aerosol and Visibility Observational (BRAVO) Study was conducted in Big Bend National Park, Texas, July through October 1999. Daily PM…”
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Human Cell Mutagens in Los Angeles Air by Hannigan, Michael P, Cass, Glen R, Penman, Bruce W, Crespi, Charles L, Lafleur, Arthur L, Busby, William F, Thilly, William G

“…The human cell mutagenicity of particulate air pollution samples collected in southern California is measured. The human cell mutation assay used in this study…”
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Drop size-dependent chemical composition of clouds and fogs. Part II: Relevance to interpreting the aerosol/trace gas/fog system by Moore, Katharine F., Eli Sherman, D., Reilly, Jill E., Hannigan, Michael P., Lee, Taehyoung, Collett, Jeffrey L.

“…Size-resolved fog drop chemical composition measurements were obtained during a radiation fog campaign near Davis, California in December 1998/January 1999…”
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Organic compounds in radiation fogs in Davis (California) by Herckes, Pierre, Hannigan, Michael P, Trenary, Laurie, Lee, Taehyoung, Collett, Jeffrey L

“…New stainless steel active fogwater collectors were designed and used in Davis (CA, USA) to collect fogwater for the speciation of organic matter. Organic…”
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Source Contributions to the Mutagenicity of Urban Particulate Air Pollution by Hannigan, Michael P., Busby, William F., Cass, Glen R.

“…Using organic compounds as tracers, a chemical mass balance model was employed to investigate the relationship between the mutagenicity of the urban organic…”
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Respeciation of organic gas emissions and the detection of excess unburned gasoline in the atmosphere by Harley, Robert A, Hannigan, Michael P, Cass, Glen R

“…New chemical composition profiles for key organic gas emission sources in the Los Angeles area are introduced and reconciled with ambient data…”
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Testing the performance of field calibration techniques for low-cost gas sensors in new deployment locations: across a county line and across Colorado by Casey, Joanna Gordon, Hannigan, Michael P

“…We assessed the performance of ambient ozone (O3) and carbon dioxide (CO2) sensor field calibration techniques when they were generated using data from one…”
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Comparisons of urban and rural PM10-2.5 and PM2.5 mass concentrations and semi-volatile fractions in northeastern Colorado by Clements, Nicholas, Hannigan, Michael P, Miller, Shelly L, Peel, Jennifer L, Milford, Jana B

“…Coarse (PM10-2.5) and fine (PM2.5) particulate matter in the atmosphere adversely affect human health and influence climate. While PM2.5 is relatively well…”
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Assessing a low-cost methane sensor quantification system for use in complex rural and urban environments by Collier-Oxandale, Ashley, Casey, Joanna Gordon, Piedrahita, Ricardo, Ortega, John, Halliday, Hannah, Johnston, Jill, Hannigan, Michael P

“…Low-cost sensors have the potential to facilitate the exploration of air quality issues on new temporal and spatial scales. Here we evaluate a low-cost sensor…”
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Indoor Pollutant Levels from the Use of Unvented Natural Gas Fireplaces in Boulder, Colorado by Dutton, Steven J., Hannigan, Michael P., Miller, Shelly L.

“…High CO and NO 2 concentrations have been documented in homes with unvented combustion appliances, such as natural gas fireplaces. In addition, polycyclic…”
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