Sisler, James F., authorHuffman, Dale, authorLatimer, Douglas A., authorCooperative Institute for Research in the Atmosphere (Fort Collins, Colo.), publisher2022-08-022022-08-021993-02https://hdl.handle.net/10217/235497February 1993.Principal investigators: William C. Malm, Marc L. Pitchford.This report describes data obtained from the first three years, March 1988 through February 1991, of the IMPROVE measurement program Interagency Monitoring of Protected Visual Environments). IMPROVE is a cooperative visibility monitoring effort between the U.S. Environmental Protection Agency, federal land management agencies, and state air agencies.reportsengCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.Haze -- United StatesAerosols -- Environmental aspects -- United StatesAir -- Pollution -- United StateText