Sources

Cautions recorded with the data

California Proposition 65 list

990 rows = 965 active and 25 delisted. OEHHA ships delisted chemicals inline in the same sheet; 111 entries carry no CAS number and match by name only.transcribed from docs/reference/DATA-PROVENANCE-screening-lists.md §1

REACH SVHC Candidate List

263 rows = 253 unique entries; a substance listed on several dates for several Article 57 reasons occupies more than one row. 41 rows carry no CAS and match by name only. The list updates twice yearly, so a mid-2026 update may postdate this snapshot.transcribed from docs/reference/DATA-PROVENANCE-screening-lists.md §2

EPA TSCA §8(a)(7) PFAS reference list

EPA's required framing for this list, verbatim: "This list is EPA's explicitly non-exhaustive reference subset of a broader structural definition of PFAS, and it excludes polymers and UVCBs that may still be reportable. Absence from this list does not mean the substance is not a PFAS or is not reportable." 2,513 rows carry no CAS.transcribed from docs/reference/DATA-PROVENANCE-screening-lists.md §3

CEPA Schedule 1 Toxic Substances List

Post-2023 (Bill S-5) structure: Part 1 = 19 entries, Part 2 = 137. No entry carries a CAS number, so matching against this list is name-level only. The CAS association layer is a separate ECCC Substances Search export retrieved 2026-08-02 and is explicitly non-exhaustive.transcribed from docs/reference/DATA-PROVENANCE-screening-lists.md §4 and Amendment 3

TSCA Chemical Substance Inventory, non-confidential portion

The non-confidential portion only. Substances whose identity is claimed as confidential business information are absent from this file, so absence is not evidence that a substance is not on the Inventory. EPA labels the release 07/2026 and generated the CSVs on 2026-07-21; both facts are recorded because they differ.transcribed from docs/reference/DATA-PROVENANCE us-tsca-inventory.md §1

NIOSH Chemical Protective Clothing (CPC) database

Archived by NIOSH and no longer updated. Generic material classes only, never brand or product names. For 307 of the 511 chemicals NIOSH lists no generic barrier material and defers to manufacturer data.transcribed from docs/reference/NIOSH_GLOVE_CPC_VERIFIED.md

GHS hazard statements (H-codes)

98 codes = 80 active single codes and 18 combined codes. Five codes deleted at Rev.10 are not carried.transcribed from docs/reference/GHS_Rev10_H_STATEMENTS_VERIFIED.md

GHS precautionary statements (P-codes)

132 codes = 98 active single codes and 34 combined codes. Eight codes deleted at Rev.10 are not carried. Slashes mark supplier-selectable alternatives, square brackets mark optional text, and ellipses mark text the supplier must complete; all three are part of the official text and are rendered verbatim.transcribed from docs/reference/P_STATEMENTS_REV10_VERIFIED.md

GHS hazard pictograms

Pictogram artwork is the MIT-licensed set at github.com/karlnorling/ghs-hazard-pictograms, of canonical UNECE and Wikimedia-derived geometry. The module header records no publisher release or retrieval date, so neither is stated here.transcribed from lib/tools/ghs-pictograms.ts module header

Safety data sheet 16-section structure

The post-2024 HazCom update text, aligned to GHS Rev.7. Sections 1 to 11 and 16 carry mandatory content; sections 12 to 15 must appear as headings but their content falls outside OSHA jurisdiction.transcribed from docs/reference/SDS_16_SECTIONS_VERIFIED.md

GHS acute toxicity estimate tables

Category boundaries and point estimates for five exposure routes, not a substance list, so no entry count applies.transcribed from docs/reference/GHS_ATE_AND_PG_VERIFIED.md §A and §B

DOT Class 3 packing-group criteria

Flash-point and boiling-point criteria, not a substance list, so no entry count applies.transcribed from docs/reference/GHS_ATE_AND_PG_VERIFIED.md §C

OSHA Process Safety Management highly hazardous chemicals

Appendix A is reproduced as published, including the regulation's own quirks: the "Nickel Carbonly" spelling, duplicate rows for several substances, and the malformed Propyl Nitrate CAS 627-3-4, which the tool discloses beside the threshold rather than silently correcting.transcribed from docs/reference/PSM_1910119_APPA_VERIFIED.md

EPA Risk Management Program regulated substances

140 entries = 77 regulated toxic substances (Table 1) and 63 regulated flammable substances (Table 3). Tables 2 and 4 are the same lists in CAS order and are not duplicated.transcribed from docs/reference/RMP_68130_VERIFIED.md

EPA VOC-exempt compounds

The tool carries 7 of the compounds named in (s)(1); the paragraph names more than the tool carries, and is amended by rulemaking. A compound absent from the tool's list is not thereby non-exempt. Only the federal list applies here: California districts (CARB, SCAQMD) publish different exempt lists.transcribed from docs/reference/VOC_51100s_VERIFIED.md

RCRA hazardous waste identification

Federal scope only. State programs can be broader, with additional listings, additional characteristics and stricter thresholds.transcribed from components/tools/rcra/rcra-tree.tsx source-status header

EPCRA Tier II reporting thresholds

The threshold is measured at any one time during the year and drops to zero on an authority's request. State programs vary in mandates, portals, fees and thresholds.transcribed from components/tools/tier-two/tier-two-tree.tsx source-status header

OSHA permissible exposure limits (Tables Z-1, Z-2, Z-3)

CAS numbers in Table Z-1 are informational only; enforcement is by substance name. A row reading "see 1910.xxxx" is governed by its own substance standard, so the tool shows that pointer rather than a number.transcribed from docs/reference/OSHA_Z_TABLES_VERIFIED.md

NIOSH recommended exposure limits (Pocket Guide dataset)

OSHA PELs largely date to 1971 adoptions, and NIOSH records that many RELs predate the 1988 update. An IDLH recorded as "N.D." means no danger line was determined; it is not zero. Carbon black's carcinogen flag applies only in the presence of PAHs.transcribed from docs/reference/DATA-PROVENANCE npg-us-oel.md

EU occupational exposure limit values

82 rows carry a legally binding limit under Directive 2004/37/EC; the remainder are non-binding indicative values. 20 rows are name-keyed group entries carrying no CAS.transcribed from lib/tools/ppe-oel/eu-oel.ts header, with the retrieval date read from the source_export_date column of docs/reference/eu-oel.csv

ppm to mg/m³ conversion constant

The formula is stated for reference conditions of 25 °C and 1 atm, so a converted value belongs to those conditions and not to another temperature or pressure.transcribed from docs/reference/PPM_MGM3_CONVERSION_VERIFIED.md

CAMEO Chemicals reactivity data

A compatible result means no reaction is predicted between two reactive groups, not that co-storage is approved. Predictions are pairwise: three or more substances together can react in ways this dataset cannot predict.transcribed from docs/reference/DATA-PROVENANCE cameo-reactivity.md