%0 Conference Paper
%K Black carbon
%K Nitrate
%K PM2.5
%K Sulfate
%A Susanne V Hering
%A Melissa M Lunden
%A Thomas W Kirchstetter
%A Tracy L Thatcher
%A Kenneth L Revzan
%A Richard G Sextro
%A Nancy J Brown
%A John G Watson
%A Judith C Chow
%B 9th International Conference on Indoor Air 2002
%C Monterey, CA
%D 2002
%G eng
%I Indoor Air 2002, Santa Cruz, CA
%P 874-879
%T Indoor, Outdoor And Regional Profiles Of Pm2.5 Sulfate, Nitrate And Carbon
%V 1
%2 LBNL-49980
%X <p>Fine particle concentrations were measured simultaneously at three locations: a regional monitoring site in Fresno, California, a backyard of an unoccupied residence in Clovis, California located 6 km northeast of the regional site; and indoors at the same residence. Measurements included 10-min determination of PM<sub>2.5</sub> nitrate, sulfate and carbon using an automated collection and vaporization system, and black carbon measured by light attenuation through a filter deposit. Specific outdoor PM<sub>2.5</sub> constituents were compared to assess the appropriateness of using regional data to model indoor concentrations from outdoor sources. The outdoor data show that, in general, the regional results provide a good representation of the concentrations seen at the building exterior. The indoor concentrations showed considerable attenuation as well as a broadening and time-lag for the concentration peaks. The concentration reduction was the largest for PM<sub>2.5</sub> nitrate, which appears to undergo phase changes in addition to indoor deposition and penetration losses.</p>