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arbcombo -- Research – Understanding Ultrafine Particles in CA Houses and Schools -- Final Report is Available
Posted: 15 Apr 2010 08:47:52
The final research report for the study titled “ULTRAFINE PARTICLE CONCENTRATIONS IN SCHOOLROOMS AND HOMES,” conducted by Doctor William Nazaroff, in conjunction with the University of California, Berkeley, has been posted to ARB’s website. The primary goal of this project was to better understand the nature and concentration of ultrafine particles (UFP) in houses and classrooms. The researchers conducted experiments on UFP and co-pollutants in seven houses and six classrooms in the East Bay near San Francisco, California. The researchers collected time-resolved measurements of particle number concentrations both indoors and outdoors as well as measurements of nitric oxide, ozone, carbon dioxide and carbon monoxide. This research provides us with a better picture of how building factors, human occupancy and indoor source use influence concentrations of, and exposure to, ultrafine particles. The researchers found that particle levels in classrooms and houses were much higher when people occupied those environments. In houses this was due to particles from both indoor and outdoor sources. Indoor sources included cooking and the use of natural gas furnaces and candles. In classrooms particle levels primarily depended on outdoor air entering the classroom through infiltration, mechanical ventilation, and the opening of doors and windows. The researchers also found that people were exposed to a higher daily average particle number of UFP in houses than in classrooms. The Air Resources Board sponsored this research as contract 05-305. You may access the full report on our website at http://www.arb.ca.gov/research/apr/past/indoor.htm. You may find additional information about the Board’s Research Program at http://www.arb.ca.gov/research/research.htm, and additional information about the Board’s Indoor Air Quality Program and activities at http://www.arb.ca.gov/research/indoor/INDOOR.HTM. If you have problems accessing the report or the web pages, please contact Heather Choi at hchoi@arb.ca.gov or 916-322-3893. For questions regarding the report’s content please contact Stephanie Parent at either sparent@arb.ca.gov or 916-324-0551. You are receiving this single arbcombo email because you are a subscriber to or have made a public comment to one or more of the following lists: indoor, research.