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• W2001125293 abstract "ISEE-0706 Background and Objectives: In earlier work based on PM2.5 speciation network data in and near New York City (NYC), we showed that nickel (Ni) concentrations were much higher in NYC than in nearby states, and that NYC levels, but not those in nearby states, were much higher in the winter than in summer. However, all of the speciation sites in NYC were in the northern half of the city. In one of our concentrated ambient particle (CAPs) exposure studies using a murine model, Ni was shown to be an important component of ambient air PM2.5 that was significantly associated with increased heart rate (HR) and decreased HR variability (HRV). Several recent epidemiological analyses show consistent effects, suggesting that Ni is an important effect modifier for mortality associated with PM2.5 exposure. Methods: In order to determine the distributions of Ni and other PM2.5 components within NYC, we collected 8 weeklong filter samples at 11 sites throughout NYC in both winter and summer, and measured the concentrations of the elements by x-ray fluorescence (XRF). The resulting data, together with speciation network site data, were used to construct seasonal average concentration isopleth maps for Ni, vanadium (V), and other elements. Results: Ni was much higher in Bronx than in Brooklyn, and much higher in winter than in summer. The highest winter concentrations observed under ambient conditions were similar to those from CAPs studies that show HR and HRV effects in mice. We will provide an analysis of ∼33 other elements measured, including tracers of traffic (e.g. elemental carbon, Pb, and Zi), resuspended road dust (Fe, Si, Mn, Al, and Ti), and biomass burning (elemental carbon, K, and Ca). Conclusions: Spatial variability of chemical components of fine aerosol is highly variable in NYC, which has important implications for ambient exposure studies." @default.
• W2001125293 created "2016-06-24" @default.
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• W2001125293 date "2009-11-01" @default.
• W2001125293 modified "2023-09-27" @default.
• W2001125293 title "On the Sources of Ambient Respirable Particles Laden with Trace Metals: An Investigation of Extensive Sources of Aerosol with High Fractions of Transition Metals in New York City" @default.
• W2001125293 doi "https://doi.org/10.1097/01.ede.0000362675.89306.7c" @default.
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