The purpose of the report is to disseminate information provided to the NATICH data base by State and local air agencies and EPA on their air toxics activities. The report supersedes previous reports published in September 1984, March 1985, September 1985, July 1986, July 1987, July 1988, July 1989, and July 1990. It updates the information in the first eight reports and contains information received through August 12, 1991. The report includes a listing of State and local agencies that have provided information to the Clearinghouse, air toxics contacts, regulatory program information, acceptable ambient concentration guidelines or standards and the bases of those guidelines/standards, pollutant research information, methods development activities, permitting data, source testing data, ambient monitoring information, emissions inventory information, and risk assessment information. Because of the large volume of data that now resides in the data base, the document reports only a subset of the permitting and source testing data.

Cover title: NATICH data base report on state, local, and EPA air toxics activities. "Prepared for Ms. Melissa McCullough, Emission Standards Division, Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency." Shipping list no.: 91-0159-P. "July 1990." "EPA-450/3-90-012." "EPA Contract No. 68D80065." "Work Assignment No. 2-7."