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8-hour Ozone NAAQS Implementation
Explanation of File Formats

Information provided for informational purposes onlyNote: EPA no longer updates this information, but it may be useful as a reference or resource. See the latest information at the Ozone Implementation web site
Adobe Acrobat Files (PDF)
PDF files are viewed and printed with the use of Adobe Acrobat Reader Exit EPA Disclaimer that is free of charge from Adobe.
HTML Files (HTML or HTM)
Hypertext markup language files which can be read by a web browser.
PowerPoint Files (PPT)
Microsoft PowerPoint files.
Rich Text Format Files (RTF)
Generic word processor files (e.g., Microsoft Word).
Text Files (TXT)
Plain text files that can be read by any text editor or word processing software.
Word Files (DOC)
Microsoft Word files.
WordPerfect Files (WPD)
Corel WordPerfect files.

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