Heidenfelder, Brooke L., Reif, David M., Harkema, Jack R., Cohen Hubal, Elaine A., Hudgens, Edward E., Bramble, Lori A., ...
The interaction between air particulates and genetic susceptibility has been implicated in the pathogenesis of asthma. The overall objective of this study was to determine the effects of inhalation...
Douglas, Thomas A, Sturm, Matthew, Simpson, William R, Blum, Joel D, Alvarez-Aviles, Laura, Keeler, Gerald J, ...
Mercury is deposited to the Polar Regions during springtime atmospheric mercury depletion events (AMDEs) but the relationship between snow and ice crystal formation and mercury deposition is not well...
Patterns of Mercury Deposition and Concentration in Northeastern North America (1996–2002) (2005)
Brulotte, Raynald, Boulet, Gille, Poissant, Laurier, VanArsdale, Alan, Weiss, Jeri, Keeler, Gerald J., ...
Data from 13 National Atmospheric Deposition Program Mercury Monitor Network (NADP/MDN) monitoring stations (1996–2002) and the Underhill (VT) event-based monitoring site (1993–2002) were...
Estimation and Mapping of Wet and Dry Mercury Deposition Across Northeastern North America (2005)
Poissant, Laurier, Brulotte, Raynald, Chalmers, Ann, Miller, Eric K., Van Arsdale, Alan, Keeler, Gerald J., ...
Whereas many ecosystem characteristics and processes influence mercury accumulation in higher trophic-level organisms, the mercury flux from the atmosphere to a lake and its watershed is a likely...
Long-term Atmospheric Mercury Wet Deposition at Underhill, Vermont (2005)
Gratz, Lynne E., Al-wali, Khalid, Keeler, Gerald J.
Section 112(m) of the 1990 Clean Air Act Amendments, referred to as the Great Waters Program, mandated an assessment of atmospheric deposition of hazardous air pollutants (HAPs) to Lake Champlain....
Comparison of methods for particulate phase mercury analysis: sampling and analysis (2002)
Lynam, Mary M., Keeler, Gerald J.
Accurate and reliable sampling and analysis of mercury forms is an overriding aim of any atmospheric monitoring effort which seeks to understand the fate and transport of the metal in the...
Mercury Accumulation in Foliage over Time in Two Northern Mixed-Hardwood Forests (2002)
Rea, A. W., Lindberg, S. E., Scherbatskoy, Timothy, Keeler, Gerald J.
Concentrations of mercury (Hg) in live foliage increased ten-fold from spring bud break (mean ± std. dev. from bothsites: 3.5±1.3 ng g -1 ) to autumn litterfall(36±8 ng g -1 ). Mercury in foliage...
Zhang, H., Lindberg, S. E., Marsik, F. J., Keeler, Gerald J.
Air/surface exchange of mercury was investigated over background soils at five sites in the Tahquamenon River watershed in the Michigan Upper Peninsula in the summer of 1998. Measurements of Hg...
Factors Controlling Mercury Transport in an Upland Forested Catchment (1998)
Scherbatskoy, Timothy, Shanley, James B., Keeler, Gerald J.
Total mercury (Hg) deposition and input/output relationships were investigated in an 11-ha deciduous forested catchment in northern Vermont as part of ongoing evaluations of Hg cycling and transport...
Historical trends of airborne trace metals in Detroit from 1971 to 1992 (1996)
Warner, Peter O., Pirrone, Nicola, Keeler, Gerald J., Nriagu, Jerome O.
Ambient concentrations of particulate Fe, Zn, Ph, Ni, Cr, Cd and Hg were measured at nine sites located in the metropolitan area of Detroit from 1971 to 1992. The ambient concentrations of all the...
Pirrone, Nicola, Keeler, Gerald J., Glinsorn, G.
The importance of participate mercury (Hg(p)) in the transport, chemistry and deposition of this toxic metal has long been underestimated and largely ignored. While it was once believed to constitute...
Vette, A. F., Keeler, Gerald J., Evans, G., Stevens, R., Dvonch, J. T.
An intensive multi-site pilot study of atmospheric Hg was conducted in Broward County, Florida in August and September of 1993. Broward County, which contains the city of Fort Lauderdale, is located...
Ambient levels and dry deposition fluxes of mercury to Lakes Huron, Erie and St. Clair (1995)
Pirrone, Nicola, Glinsorn, G., Keeler, Gerald J.
Ambient concentrations and dry deposition fluxes of Hg in the gas and particle phase to Lakes St. Clair, Erie and Huron were estimated with a hybrid receptor-deposition model (HRD). The ambient gas...
Hoyer, M., Burke, J., Keeler, Gerald J.
To assess the sources, transport and deposition of atmospheric mercury (Hg) in Michigan, a multi-site network was implemented in which Hg concentrations in event precipitation and ambient samples...
Burke, J., Hoyer, M., Keeler, Gerald J., Scherbatskoy, Timothy
The “Great Waters” program, established in the 1990 Clean Air Act Amendments, mandated that atmospheric deposition of hazardous air pollutants to Lake Champlain (including Hg) be assessed. An...
Mercury concentrations in two “great waters” (1995)
Cleckner, L. B., Meier, Peter G., Keeler, Gerald J., Esseks, E. S.
Although many sources of Hg to surface waters have been identified including atmospheric deposition, resuspension of contaminated sediments, and direct discharges, there are very few recent data on...
International field intercomparison of atmospheric mercury measurement methods (1995)
Schroeder, W. H., Keeler, Gerald J., Kock, H., Roussel, P., Schneeberger, D., Schaedlich, F.
To determine the extent of comparability of sampling and analytical procedures for atmospheric mercury (Hg) being used by different scientific groups around the world and hence the compatibility of...
Sources of mercury in the Arctic (1995)
Pacyna, J. M., Keeler, Gerald J.
Global and regional emission inventories of mercury are reviewed with special emphasis on the source regions with potential impact on the Arctic environment. These sources are located mostly in...
Regional trace element and sulfate transport (1994)
Keeler, Gerald J., Pierson, William R.
The goal of this paper was to investigate the transport of atmospheric sulfate and trace elements across the northeastern U.S.A. Data from a number of sites--Underhill (VT), Whiteface Mountain (NY),...
The flux of anthropogenic trace metals into the arctic from the mid-latitudes in 1979/80 (1994)
Akeredolu, F. A., Barrie, L. A., Olson, M. P., Oikawa, K. K., Pacyna, J. M., Keeler, Gerald J.
The flux of trace metals into the Arctic atmosphere between 0 and 3.5 km altitude for the period July 1979-June 1980 was determined using a chemical transport modeling approach used previously for...
Detection of oxidative mutagens in an urban air-particulate extract: a preliminary study (1992)
Hoyer, Marion E., Keeler, Gerald J., Ball, James C.
The Ames assays strains TA98 and TA100 have been useful in characterizing complex mixtures from organic solvent extracts of particles from diesel-powered vehicles, ambient air, and other sources. In...
Koutrakis, Petros, Thompson, Kimberly M., Wolfson, Jack M., Spengler, John D., Keeler, Gerald J., Slater, James L.
Existing methods of measuring atmospheric aerosol strong acidity adequately prevent neutralization of fine-particle acidity by removing course alkaline particles and gaseous ammonia from air samples....
The sources of aerosol elemental carbon at Allegheny Mountain (1990)
Keeler, Gerald J., Japar, Steven M., Brachaczek, Wanda W., Norbeck, J. M., Pierson, William R.
Aerosol elemental carbon measurements were taken at two rural sites in southwestern Pennsylvania during August 1983. Carbon, though a small part of the aerosol mass at both sites, was a leading...
Pierson, William R., Brachaczek, Wanda W., Japar, Steven M., Norbeck, Joseph M., Keeler, Gerald J.
Atmospheric acidity as HNO3(g), SO2(g), and aerosol H+ was measured on Allegheny Mountain and Laurel Hill in southwest Pennsylvania in August 1983. The aerosol H+ appeared to represent the net after...
Composition and origin of summertime air pollutants at Deep Creek Lake, Maryland (1989)
Vossler, Teri L., Lewis, Charles W., Stevens, Robert K., Dzubay, Thomas G., Gordon, Glen E., Tuncel, Semra G., ...
A 1 month intensive summertime field study conducted in rural western Maryland resulted in a comprehensive set of fine particle, gaseous and meteorological data. Sulfur in the assumed form of...
Effect of ambient humidity on dichotomous sampler coarse/fine ratios (1988)
Keeler, Gerald J., Brachaczek, Wanda W., Japar, Steven M., Pierson, William R.
Atmospheric aerosols were measured in August 1983 on Allegheny Mountain and Laurel Hill in southwestern Pennsylvania. Ambient humidity was observed to influence the coarse to fine particle ratios as...
Keeler, Gerald J, Dvonch, Timothy, Yip, Fuyuen Y, Parker, Edith A, Isreal, Barbara A, Marsik, Frank J, ...
We report on the research conducted by the Community Action Against Asthma (CAAA) in Detroit, Michigan, to evaluate personal and community-level exposures to particulate matter (PM) among children...
Air Pollution–Associated Changes in Lung Function among Asthmatic Children in Detroit
Lewis, Toby C., Robins, Thomas G., Dvonch, J. Timothy, Keeler, Gerald J., Yip, Fuyuen Y., Mentz, Graciela B., ...
In a longitudinal cohort study of primary-school–age children with asthma in Detroit, Michigan, we examined relationships between lung function and ambient levels of particulate matter ≤ 10 μm...
Keeler, Gerald J, Dvonch, Timothy, Yip, Fuyuen Y, Parker, Edith A, Isreal, Barbara A, Marsik, Frank J, ...
We report on the research conducted by the Community Action Against Asthma (CAAA) in Detroit, Michigan, to evaluate personal and community-level exposures to particulate matter (PM) among children...
Air Pollution–Associated Changes in Lung Function among Asthmatic Children in Detroit
Lewis, Toby C., Robins, Thomas G., Dvonch, J. Timothy, Keeler, Gerald J., Yip, Fuyuen Y., Mentz, Graciela B., ...
In a longitudinal cohort study of primary-school–age children with asthma in Detroit, Michigan, we examined relationships between lung function and ambient levels of particulate matter ≤ 10 μm...