No. 22

Naphthalene

CAS: 91-20-3Category: IndustrialDirective: EU 2026/805 Annex VI

Compliance target22 Dec 2027

Environmental Quality Standards

Water EQS

Values in μg/L (micrograms per litre)

AA-EQS — Inland waters	2 μg/L
AA-EQS — Coastal & transitional	2 μg/L
MAC-EQS — Inland waters	130 μg/L
MAC-EQS — Coastal & transitional	130 μg/L

Pre-existing EQS — enforcement from 22 Dec 2027

Structure, physicochemical properties, and EU regulatory data

EQS values from Directive (EU) 2026/805 Annex VI.

Last verified: June 2026