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- W2049026864 abstract "Maine currently has the second fastest growing asthma rate in the nation 9.4% of the adult population has asthma and one out of eight children is affected. The factors behind this increase are poorly understood, but previous reports suggest that biologically soluble metal ions from particulate matter (PM10) may play a role in asthma episodes. In an effort to study this issue, we first identified geographic and temporal trends in Maine asthma hospitalizations. Clinical data show a strong fall peak in asthma admissions with weaker peaks in January and May, and a summer low in asthma admissions. Asthma admissions are also higher in the cities than in the rural areas in Maine. We then analysed PM10 collected by the Maine Department of Environmental Protection in three different Maine locations in the years 2000 and 2001, at times when clinical asthma data showed peaks and during the summer low period. We also collected soil samples in the same locations. The PM10 and soils were analysed for 10 metals by acid extraction to determine total metal content and then with cell culture medium, DMEM/F12+CCS growth medium, to determine metal biosolubility. Our results showed that Mn, Cu, Pb, As, V, Ni and Al were present in the Maine PM samples. V, Ni and Pb showed seasonal variation, while the others were relatively constant throughout the year. Pb and Al did not appear to be soluble in the biological medium. There was also variation from location to location with the urban area showing the highest concentrations for most metals. Aluminium was present in the highest concentration in soil samples, followed by Mn and V. Only Cu was biologically available in soils. We determined from M/Al ratios that most of the PM10 did not originate from local crustal material." @default.
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- W2049026864 date "2005-02-01" @default.
- W2049026864 modified "2023-09-30" @default.
- W2049026864 title "Airborne particulates and asthma: a Maine case study" @default.
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- W2049026864 doi "https://doi.org/10.1191/0748233705th218oa" @default.
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