Interagency Monitoring of Protected Visual Environments

Diminishing ViewOur national Parks and Wilderness Areas possess many stunning vistas and scenery. Unfortunately, these scenes are diminished by uniform haze causing discoloration and loss of texture and visual range. Layered hazes and plume blight also detract from the scene.  Recognizing the importance of visual air quality, congress included legislation in the 1977 Clean Air Act to prevent future and remedy existing visibility impairment in Class I areas To aid the  implementation of this legislation, the IMPROVE program was initiated in 1985.  This program implemented an extensive long term monitoring program to establish the current visibility conditions, track changes in visibility and determine causal mechanism for the visibility impairment in the National Parks and Wilderness Areas.

The purpose of this website is to provide access to the IMPROVE monitoring data resources and educational material  on the science of visibility and regulations.  First time visitors should visit the Overview section which summarizes the IMPROVE network and visibility science and regulations.

Website Categories

IMPROVE Resources

       

 

 

Bulletins

bullet

The Regional Haze Rule Summary data through 1988 - 2013 are now available in ascii files and via the query wizard on the FED website
 

bullet

Winter quarter 2014 nephelometer data are now available in ASCII format
 

bullet

Two new data advisories have been added
 

bullet

Simulated photographs using WinHaze visualizing changes in haze over 9 or more years (Hand et al., 2014)
 

bullet

24-hr Speciated coarse mass concentrations at nine IMPROVE sites measured in 2003 and 2004 are now available
 

bullet

The 2014 IMPROVE Calendar (Thanks to Warren White for providing funding)
 

bullet

The 2013 IMPROVE newsletter - Due to cost savings measures  IMPROVE newsletters and will be discontinued until further notice.
 

bullet

New IMPROVE Steering Committee Members
 

bullet

IMPROVE SOPs for XRF analysis, site maintenance, and installation of samplers have been updated
 

bullet

IMPROVE SOPs for sample handling and optical absorption measurements have been updated
 

bullet

2013 IMPROVE Steering Committee Meeting Presentations and Summary
 

bullet

Interactive Program on Monitoring the Changing Air Quality in the Edwin B. Forsythe National Wildlife Refuge
 

bullet

Update to TOR/TOT Carbon Analysis SOP
 

bullet

The online data access tools has been switched from VIEWS to FED
 

bullet

2011 IMPROVE Report: Spatial and Seasonal Patterns and Temporal Variability of Haze and its Constituents in the United States
 

bullet

EPRI Reports from the Sulfate Regional Experiment (SURE) and other studies are now available. 
 

bullet

QA/QC report on the XRF and PESA data from UC Davis for the 1st - 3rd quarter, 2009 data.
 

bullet

New gray literature article - Evaluate the Sensitivity of Deciview Calculations to Missing Data Values and Relative Humidity Factors
 

bullet

A CARB report on Visibility Reduction as Related to Aerosol Constituents by Appel et al., 1983
 

bullet

The under-correction of chloride concentrations for filter blank levels has been fixed and the data advisory has been updated.
 

bullet

One new data advisory on under-correction of chloride concentrations for filter blank levels
 

bullet

The 1988-1993 NESCAUM particulate data is now available
 

bullet

The impact of haze section of the "Exploring Visibility Concepts" tutorial has been updated
 

bullet

A new interactive tutorial presents the cycling of reactive nitrogen through our the atmosphere  and ecosystem.
 

bullet

New gray literature article - Summary of Urban Visibility Workshop and Presentations
 

bullet

Presentations and Summary from the IMPROVE - CSN Carbon PM Monitoring Workshop, UC, Davis, Jan 22- 24, 2008
 

bullet

An interactive tutorial guiding the user through air quality issues impacting Sequoia Kings Canyon National Park.  
 

bullet

A presentation comparing data from collocated IMPROVE and STN monitors has been added to the gray literature
 

bullet

Brochure on the Rocky Mountain Atmospheric Nitrogen and Sulfur  (ROMANS) Study
 

bullet

Final report reviewing the IMPROVE light extinction equation - by J. Hand and W. Malm
 

bullet

Final versions of the Regional Haze Guidance Documents