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  • Data
    • IMPROVE Data
    • Data User Guide
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    • Optical Data
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  • RHR
    • RHR Summary Data
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  • Data Resources
    • Reconstructed Fine Mass
    • The IMPROVE Algorithm
    • Haze Metrics Converter
    • WinHaze
    • Near Real-Time PM2.5 Estimates
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IMPROVE Data

For full data access, please visit the Federal Land Manager Environmental Database.

Before using any IMPROVE data, be sure to check for Data Advisories that may affect your data set. 

Site List for 1-6-day Sampling Spreadsheet (Updated October 2027)

Current Site List Spreadsheet (Updated January 2026)

All Sites (Active and Decommissioned) Spreadsheet (Updated January 2026)

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