A reprint of three special sections in the Journal of the Air Pollution Control Association; each special section was the proceedings of a symposium sponsored by the U.S. Environmental Protection Agency and a contractor. Includes bibliographical references and indexes.; Symposium on the Use of Fabric Filters for the Control of Submicron Particulates, Boston, 1974. Fine particle fabric filtration.--Symposium on the Use of Wet Scrubbers for the Control of Fine Particles, San Diego, Calif., 1974. Fine particle scrubbing.--Symposium on the Use of Electrostatic Precipitators for the Control of Fine Particles, Pensacola Beach, Fla., 1974. Fine particle electrostatic precipitation.