Spain · National · Royal Decree

Royal Decree 427/2021 · Used oils and diesel emissions

Amending instrument not repealed according to the BOE record; consult the current receiving legislation

Official title in the original Spanish publication: Real Decreto 427/2021, de 15 de junio, por el que se modifica el Real Decreto 665/1997, de 12 de mayo, sobre la protección de los trabajadores contra los riesgos relacionados con la exposición a agentes cancerígenos durante el trabajo.

On this page
  1. What it regulates
  2. Who it applies to
  3. Key provisions
  4. History and versions
  5. Transitional provisions and application notes
  6. Official BOE legal relationships
  7. Official sources
  8. Explore the concepts in Sabentis Explore

What it regulates

It amended the annexes to Royal Decree 665/1997 to include work involving exposure to specified used mineral oils and diesel engine emissions, and to update agents and limit values.

Who it applies to

Work covered by the new Annex I entries and exposure to Annex III agents. It is relevant to maintenance, transport, workshops, mining and other activities according to actual exposure.

Key provisions

It added work involving skin exposure to mineral oils previously used in internal combustion engines to lubricate and cool moving parts. It does not automatically equate every new oil or waste product with that situation.

Sole article: Annex I

It included work involving diesel engine emissions among the processes covered by Royal Decree 665/1997’s preventive regime.

Sole article: diesel emissions

It expanded the list of agents and their limits or notations, including the significance of skin absorption. Assessment must consider exposure routes, not only airborne concentration.

Sole article: Annex III

History and versions

Initial publication: 16/06/2021 · Initial entry into force: 17/06/2021

BOE-A-2021-10029

Published on 16 June 2021 and effective from 17 June 2021, with deferred application of the diesel-emissions limit: 21 February 2023 generally and 21 February 2026 for underground mining and tunnel construction. Annex III was subsequently amended in 2022, 2024 and 2026.

Published on 16 June 2021 and effective from 17 June 2021, with deferred application of the diesel-emissions limit: 21 February 2023 generally and 21 February 2026 for underground mining and tunnel construction. Annex III was subsequently amended in 2022, 2024 and 2026.

Publication: 16/06/2021 · Effective date: 17/06/2021

BOE-A-2021-10029

This instrument’s amendments are incorporated into Royal Decree 665/1997 · Carcinogens, mutagens or reprotoxic substances. The latest published wording of the receiving text checked is dated 2026-10-23; that date belongs to the receiving instrument and is not a new publication of this amending instrument.

BOE-A-1997-11145
Incorporation of this amendment into consolidated receiving texts

The table identifies where this amendment was incorporated. Dates refer to its versions in each receiving text, not a complete history of subsequent amendments to that text.

PublicationEffective dateOfficial referenceReceiving textAffected provisions
16/06/202117/06/2021BOE-A-2021-10029Royal Decree 665/1997 · Carcinogens, mutagens or reprotoxic substancesAnnex I, Annex III

Transitional provisions and application notes

  • By the 14 November 2026 review date, both deferred diesel application dates have passed. Do not describe the mining exception as an ongoing moratorium.

    Historical timetable
  • The 2021 table supports historical reconstruction, but current duties must be checked against the current Annex III to Royal Decree 665/1997.

    Current table

Official BOE legal relationships

Relationships may affect only specific provisions. They do not by themselves determine the status of the whole instrument: consult its history and application notes.

Earlier references (2)

Official sources

Official sources checked on 14/11/2026. Updating a database record does not by itself mean that the legislation has been amended.

Sources for the amending instrument

  1. Original publication and analysis
  2. ELI identifier

The BOE provides no separate consolidated text for this amending instrument. Its original publication and the receiving texts are linked so that the current wording can be consulted.

Consolidated receiving texts

  1. Royal Decree 665/1997 · Carcinogens, mutagens or reprotoxic substances

Official BOE sources consulted on 14 November 2026. This amending instrument should be read together with the current receiving legislation. Consolidation is for information; consult the official publication for legal purposes.

Sabentis editorial summary. The official title and legal sources are retained in Spanish. This is not an official English translation and does not replace the legal text.

Editorial information

Publication date: 14 November 2026.

Editorial responsibility: Sabentis editorial team.

Editorial review by Pablo RodríguezLinkedIn

Executive Vice President of the International ORP Foundation and Chief Financial Officer of Sabentis.

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