U.S. Visibility Trends, 1960-1992

Contents:

• Haze Trend Summary
  • Haze Trend Background
• Haze Data From Visual Range
  • Definition and Measurement
  • Data Sources and Processing
  • Trends of Haze at Selected Sites
  • Data Quality Control
  • Data Processing and Presentation
  • Data Filtering and Aggregation
  • Role of Meteorological Parameters
• Regional and Seasonal Patterns
• Conclusions
• Acknowledgments and References
• Figures

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