Aerosol Concentrations During the 1999 Fresno Exposure Studies as Functions of Size, Season, and Meterology

P. A. Lawless Research Triangle Institute, Research Triangle Park, North Carolina

C. E. Rodes Research Triangle Institute, Research Triangle Park, North Carolina

G. Evans National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina

L. Sheldon National Exposure Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina

J. Creason National Health and Environmental Effects Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina

Two 1999 Fresno exposure studies took place in February (winter season) and April/May (spring season) for periods of four weeks each. During that time, nearly continuous measurements of outdoor aerosol concentrations were made with a TSI Scanning Mobility Particle Sizer (SMPS) and a PMS optical particle counter (LASX). These instruments provide particle size distribution information from about 0.01 to 3

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