Spatial and Temporal Characterization of Fine Particulate Matter Mass Concentrations in California, 1980-2002 Final rept

摘要

Studies of fine particulate matter (PM) levels, trends, and effects in California need a reliable long-term record of ambient fine PM mass concentrations. Systematic measurement of fine PM mass concentrations began nationally with implementation of the Federal Reference Method (FRM) network in 1998 and 1999. However, a variety of other monitoring networks have measured fine PM mass concentrations, other PM size fractions, and related pollutants during various periods of time and at varying numbers of sites in California from 1980 through 2002. We developed a historical record of fine PM mass concentrations by combining data from different monitoring programs, accounting for differences in measurement methods and accuracy. The product of this work is a database consisting of estimates of monthly-average fine PM mass concentrations and their uncertainties at monitoring sites in California for the period from 1980 through 2002.