Recent studies have investigated the occurrence of 6PPD and 6PPD-q in various environmental matrices across the globe. Section 4 summarizes the current state of knowledge but is not intended to represent a comprehensive review of occurrence data. The following tables, organized by medium, were compiled as an index of peer-reviewed studies that this ITRC team was aware of as of March 2024.
| Table Number and Title | Link to PDF | Link to Executable File (Word Processor Format) |
| 4-1 Surface water |  |
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| 4-2 Stormwater | |
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| 4-3 Wastewater, water treatment plants, and tap water | |
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| 4-4 Groundwater | |
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| 4-5 Roadside soil | |
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| 4-6 Sediment | |
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| 4-7 Outdoor air | |
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| 4-8 Road dust and roadside snow | |
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| 4-9 Indoor and nonroad settled dust | |
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| 4-10 Aquatic organisms and food | |
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PDF versions of each table are provided for the reader to view information in a visual format that is consistent across browsers and platforms. Executable files are provided to allow readers to sort information by the column of their choice, but may appear different visually depending on the software used to view this file. Instructions on how to sort information in a document formatted for a word processor format are widely available by internet search.
