ATDD is committed to providing our employees, customers and visitors with the most current and timely information possible. Section 508 of the Rehabilitation Act as amended, 29 U.S.C. Section 794d, requires that Federal agencies’ electronic and information technology is accessible to people with disabilities. Web pages hosted by ATDD have been tested in accordance with the provisions of this Act. If you have difficulty accessing any portion of this site or would like additional information on our 508 initiative, please e-mail the webmaster. We welcome any ideas or comments that help us improve the accessibility and usability of the ATDD web site. The Atmospheric Turbulence and Diffusion Division Section 508 standards are:
  • All ATDD pages follow the Access Board’s Section 508 web accessibility provisions. The Access Board is an independent Federal agency devoted to making information accessible for people with disabilities.
  • ATDD pages also follow as much as possible the Web Accessibility Initiative (WAI) guidelines, and the site currently meets Level A conformance of W3C-WAI Web Content Accessibility Guidelines 1.0. The Web Accessibility Initiative (WAI) is a World-Wide Web initiative to make the Web accessible to people with disabilities, and the WAI has been appointed to the Advisory Committee for the revision of U.S. Section 255 guidelines and Section 508 standards, which include Web accessibility.
  • ATDD presents information in many formats, in particular maps, photographs, animations and other data visualizations. For pages where accessibility is an issue, please request the information contained on the specific page directly from webmaster. The information or an interim response will be provided within two business days.


The links below provide Section 508 information and are not endorsed or promoted by ATDD. The WebAIM site and the WAI site are non-U.S. government websites.