Aerosol Source Characterization Study in Miami, Florida. Microscopical Analysis

摘要

In June 1975 the U.S. Environmental Protection Agency conducted an experimental program in the Miami metropolitan area to collect atmospheric aerosols for the purpose of identifying aerosol composition and determing aerosol sources. Samples were collected for mass, trace metals, and microscopical analyses. Microscopical analyses showed that the composition of Miami's TSP (total suspended particulate) was similar to that of Chicago, St. Louis, and Philadelphia, with the exception that Miami receives a significant impact from ocean spray. Mineral fragments resuspended by traffic appear to be the primary aerosol mass contributor. Rubber tire fragments and carbonaceous vehicle exhaust are also major TSP contributors. These conclusions are based solely on three sampling days at three sites and should be confirmed by additional studies. However, the aerosol types and amounts found in Miami are likely to remain fairly constant throughout the year.