RD 427/2021 and TEC/1146/2018
This is the key English regulation page for mining, tunnels and enclosed diesel environments. RD 427/2021 and Order TEC/1146/2018 matter because they turn diesel exposure, air quality and source control into practical compliance and operational questions, especially where ventilation is limited and worker exposure is critical.
Practical guidance, not placeholder text. This page has been rebuilt with the same visual structure as the rest of the English site so it matches your regulations overview and no longer appears as unstyled HTML.
Why this regulation matters
The practical importance of RD 427/2021 lies in the focus on diesel exposure, occupational protection and the need for a coherent technical response in demanding environments. In many underground contexts, this means that ventilation alone may not be enough and emission reduction at source becomes strategically relevant.
- Underground mining and tunnels
- Rail equipment working in enclosed conditions
- High-pressure HSE and compliance contexts
The role of source reduction
A major implication of the regulation is that companies need to assess whether source reduction on the machine itself is necessary. That is where retrofit becomes commercially and technically relevant: it can improve air-quality performance without forcing full fleet replacement.
Why acting early matters
Waiting until compliance pressure becomes urgent usually leads to rushed decisions, heavier dependence on ventilation and weaker capital planning. Acting early allows a more defensible technical roadmap and a better procurement position.
Recommended next step
Review the machines operating in enclosed or poorly ventilated environments, the real exposure scenario and the pollutants that matter most. Once that is clear, a retrofit strategy such as NOxBUSTER® can be evaluated on a more technical and commercially defensible basis.