£ CDA Office of Mobile Sources EPA420-B-99-011 December 1999 Calculation of I/M Waiver Adjusted for CPI 1. Use of the BLS data: CPI adjustment for 1998 = Average CPI for September 1997 - August 1998 Average CPI for September 1988 - August 1989 Average CPI-U for September 1997 - August 1998 = 1/12 times the sum of the CPI-U for each individual month from September 1997 through August 1998 (inclusive) Average CPI-U for September 1988 - August 1989 = 1/12 times the sum of the CPI-U for each individual month from September 1997 through August 1998 (inclusive) For example, the Average CPI-U for September 1988 - August 1989 = 1/12 times (119.8+ 120.2+120.3 + 120.5 + 121.1 +121.6 +122.3 +123.1 +123.8 + 124.1 + 124.4 + 124.6 ) = 122.15 The Average CPI for 1998 = 162.18 CPI adjustment for 1998 = 162.18 = 1.3277 122.15 2. The $450 + CPI value = (CPI adjustment for 1998 times $450) = 1.3277 x 450 = $597.48 3. The data is available at the following Internet Bureau of Labor Statistics CPI home page: http://stats.bls.gov/cpihome.htm To retrieve the 1989 to 1998 data, select: - "Most Requested Series" - "Consumer Price Index-All Urban Consumers (Current Series)" - "Consumer Price Index-All Urban Consumers" - Select "U.S. All Items," Years to report for: "1989 to 1999" To retrieve the September 1988 to December 1988 data, select: - "Table Containing History of CPI-U U.S. All Items Indexes and Annual Percent Changes From 1913 to Present." (The direct URL is: ftp://ftp.bls.gov/pub/special.requests/cpi/cpiai.txt) ------- Year 1989 1995 1996 1997 1998 1999 Average CPI-U 122.2 151.1 155.2 159.5 162.2 Final Waiver Amount $450.00 $557.00 $572.00 $588.00 $597.00 ------- |