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Some TRI reporting requirements have changed over time. Since the program began, new industries have been required to report, chemicals have been added or removed from the list of TRI reportable chemicals, and reporting thresholds have changed for some chemicals. These changes may affect the comparability of information presented in trend reports between years. For a description of how these changes may affect trends in TRI reporting, click on the link just above the report table titled “Are year to year changes comparable?”
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