The year or range of years that you select will affect which chemicals are included in your search. Chemicals are only included in a search if they were reported to NPRI and TRI in the same way throughout a year or range of years (i.e. they are "matched"). In addition, if your search includes a year before 1998, the search will not include industry sectors added to TRI in 1998 or transfers to recycling or energy recovery. If your search includes a year before 2002, the search will not include Petroleum Bulk Terminals, an industry added to NPRI in 2002.
For more details about the data used in Taking Stock, see Information on the Data Sets.
Note: if you change your year selection here, this may automatically change selections made in Steps 3 and 4 below.