Zobrazeno 1 - 10
of 148
pro vyhledávání: '"Gerald J. Keeler"'
Autor:
Fuyuen Y. Yip, Gerald J. Keeler, J. Timothy Dvonch, Angela G. Reyes, Graciela Mentz, Xiaohui Zhang, Thomas G. Robins, Bhramar Mukherjee, Xihong Lin, Barbara A. Israel, Paul Max, Edith A. Parker, Marie S. O'Neill, Toby C. Lewis
Publikováno v:
Science of The Total Environment. 448:48-55
Information on how ambient air pollution affects susceptible populations is needed to ensure protective air quality standards.To estimate the effect of community-level ambient particulate matter (PM) and ozone (O) on respiratory symptoms among primar
Publikováno v:
Environmental Science & Technology. 46:382-390
Coal combustion accounts for approximately two-thirds of global anthropogenic mercury (Hg) emissions. Enhanced deposition of Hg can occur close to coal-fired utility boilers (CFUBs), but it is difficult to link specific point sources with local depos
Autor:
Ali S. Kamal, James G. Wagner, Gerald J. Keeler, Annette C. Rohr, Masako Morishita, Jack R. Harkema
Publikováno v:
Atmospheric Environment. 45:7688-7697
Recent epidemiological and toxicological studies have suggested that short-term elevations of ambient fine particle mass concentrations (aerodynamic diameter The average ambient PM2.5 filter-based mass concentration during the 8-hour summer exposure
Autor:
Lynne E. Gratz, Gerald J. Keeler
Publikováno v:
Atmospheric Environment. 45:5440-5449
Daily event precipitation samples were collected from 1995 to 2006 in Underhill, VT, USA and analyzed for mercury (Hg) and trace elements. Over the 12-year period, annual Hg deposition levels at Underhill did not decline significantly despite regulat
Autor:
Gerald J. Keeler, Annette C. Rohr, Bhramar Mukherjee, Ali S. Kamal, Jack R. Harkema, James G. Wagner, Masako Morishita
Publikováno v:
Inhalation Toxicology. 23:417-430
Increases in particulate matter less than 2.5 µm (PM(2.5)) in ambient air is linked to acute cardiovascular morbidity and mortality. Specific components and potential emission sources of PM(2.5) responsible for adverse health effects of cardiovascul
Autor:
Masako Morishita, Gerald J. Keeler, Annette C. Rohr, Bhramar Mukherjee, James G. Wagner, Ali S. Kamal, Jack R. Harkema
Publikováno v:
Environmental Health Perspectives
Background Exposure to fine particulate matter [aerodynamic diameter ≤ 2.5 μm (PM2.5)] is linked to adverse cardiopulmonary health effects; however, the responsible constituents are not well defined. Objective We used a rat model to investigate li
Autor:
James G. Wagner, Gerald J. Keeler, Annette C. Rohr, Ali S. Kamal, Jack R. Harkema, Masako Morishita
Publikováno v:
Atmospheric Environment. 45:1627-1637
Recent studies have indicated that the chemical composition of ambient PM 2.5, or fine particulate matter (aerodynamic diameter 2.5 is critical to understanding source-specific health risks posed by PM 2.5 . However, ambient PM measurements are typic
Publikováno v:
Environmental Science & Technology. 44:7764-7770
Atmospheric deposition is a primary pathway by which mercury (Hg) enters terrestrial and aquatic ecosystems; however, the chemical and meteorological processes that Hg undergoes from emission to deposition are not well understood. Hg stable isotope g
Autor:
Gerald J. Keeler, J. Timothy Dvonch, Bian Liu, Frank J. Marsik, Mary M. Lynam, Joy Taylor Morgan, James A. Barres
Publikováno v:
Atmospheric Environment. 44:2013-2023
Measurements of gaseous elemental mercury (GEM), particulate mercury (Hgp), and reactive gaseous mercury (RGM) were concurrently recorded at an urban site in Detroit and a rural site in Dexter, both in Michigan for the calendar year 2004. Their avera
Autor:
Laura S. Sherman, Thomas A. Douglas, Joel D. Blum, Kelsey P. Johnson, Gerald J. Keeler, James A. Barres
Publikováno v:
Nature Geoscience. 3:173-177
In the Arctic spring, sunlight-induced reactions convert gaseous elemental mercury into compounds that are rapidly deposited on the snowpack. Analysis of the isotopic composition of mercury in snow samples collected during an atmospheric mercury depl