Analysis by state    Analysis by class I    Analysis by region    Descriptive maps    Backtrajectories    Trends analysis    PMF Modeling    Episode analysis    Dust analysis    Tribal analysis    Fish & Wildlife    Terms & acronyms For best results, please use: Internet Explorer 5 (or higher) Netscape 6 (or higher) more info...

COHA Tour This tour provides a step-by-step guide to the Causes of Haze website. The sequence of tour stops is designed to acquaint you with the background, purpose, content, and vision of COHA in a logical, intuitive manner, but each stop by itself represents a self-contained snapshot of an aspect of the COHA web site.     About the Causes of Haze Assessment web site Find out about the background and purpose of the COHA project and web site.             The Regional Haze Rule Learn about the EPA ruling that provides the foundation for COHA and defines its future goals.             Introduction to Visibility Discover more about the technical details of visibility science, and gain insight into how the data provided by COHA is used by scientists and researchers to learn about the causes and characteristics of regional haze.             Causes of Haze Assessment Scope of Work Read the detailed scope of work that defines the purpose, strategy, and goals of COHA.             Our Products View the wide variety of data and data products offered on the COHA web site.         Analysis Products Analysis by state Analysis by class I area Analysis by tribal and IMPROVE protocol sites Analysis by similar climate Analysis by similar composition Analysis by region Tribal assessment Fugitive dust analysis Data Resource Catalogs Air Quality Resources Meteorological Resources Emissions Resources Spatial Data Resources               Contact Us Send us your comments, questions, and ideas related to the COHA project. We welcome your suggestions, and are dedicated to constantly improving our web presence.