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Impact of 2002 Canadian forest fires felt 700 miles away in Baltimore, Maryland

Researchers from the Johns Hopkins Bloomberg School of Public Health analyzed how airborne particulate matter from forest fires in the Canadian providence of Quebec traveled more than 700 miles to homes in Baltimore, Md. The study authors found a dramatic increase in outdoor and indoor fine particulate matter an atmospheric pollutant that is harmful to people with respiratory diseases in Baltimore during the first weekend of July 2002, which coincided with several forest fires in Quebec. The same fine particulate matter that the authors found to be transported across large distances readily penetrated people's homes where they spend most of their time. The researchers believe this should be a public health concern because fine particulate matter can penetrate deep into the lungs. The study is published in the current online issue of Environmental Science & Technology.

"This study provides a dramatic example of the significance that global air pollution has, not only on the outdoor air quality in our communities, but on air quality indoors where even the most susceptible among us look for protection," said Timothy J. Buckley, PhD, MHS, associate professor in the Bloomberg School of Public Health's Department of Environmental Health Sciences and the study's senior author.

The researchers used satellite images, trajectory models, light detection and ranging measurements to track emissions from the Canadian forest fires to levels of particulate matter in Baltimore. During the peak of the episodes, ambient PM 2.5 levels increased eight-fold from 25 ug/m3 to 199 ug/m3 on July 7, 2002. The EPA's National Ambient Air Quality Standard was exceeded on this particular day. Indoor levels closely tracked the outdoor concentrations, indicating that being indoors at home offered little protection from the pollution episode. At the peak of the episode, PM2.5 levels as high as 366 ug/m3 were recorded inside.

The researchers said that their study is a
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Contact: Kenna L. Lowe
paffairs@jhsph.edu
410-955-6878
Johns Hopkins University Bloomberg School of Public Health
2-Dec-2004


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