title: Interpretation of trends of PM25and reconstructed visibility from the IMPROVE network.
abstract: Under the IMPROVE visibility monitoring network, federal land managers have monitored visibility and fine particle concentrations at 29 Class I area sites (mostly national parks and wilderness areas) and Washington, DC since 1988. This paper evaluates trends in reconstructed visibility and fine particles for the 10th (best visibility days), 50th (average visibility days), and 90th (worst visibility days) percentiles over the nine-year period from 1988-96. Data from these sites provides an indication of regional trends in air quality and visibility resulting from implementation of various emission reduction strategies.
authors.affiliation: Colorado State University, CIRA, Fort Collins, USA. sisler@cira.colostate.edu
authors.forename: J F
authors.initials: JF
authors.lastname: Sisler
authors.forename: W C
authors.initials: WC
authors.lastname: Malm
mesh_terms: D000397:Air Pollution / Q000032:analysis*; D003625:Data Collection; D004784:Environmental Monitoring; D010316:Particle Size; D012189:Retrospective Studies