The revised EU GMP Annex 1 came into force in August 2023, replacing the version that had been in place since 2009. For environmental monitoring in cleanrooms and controlled environments, the changes are significant — and many pharmaceutical companies are still catching up.
What is GMP Annex 1?
GMP Annex 1 is the European Union's regulatory guidance for the manufacture of sterile medicinal products. It defines requirements for cleanroom classification, environmental monitoring, contamination control and personnel behaviour. It is one of the most scrutinised documents in pharmaceutical compliance.
Key changes for environmental monitoring
1. Contamination Control Strategy (CCS)
The 2022 revision introduces the Contamination Control Strategy as a formal, site-level document. It must describe the overall approach to contamination control — including environmental monitoring — and be reviewed regularly. This is a significant new requirement that many sites do not yet have in place.
2. Continuous environmental monitoring
The revised guidance places greater emphasis on continuous monitoring over periodic sampling. For critical zones (Grade A), continuous particle monitoring is now expected for all aseptic processing operations — not just periodic measurements.
What you should review now
- Does your site have a documented Contamination Control Strategy?
- Is your Grade A monitoring continuous during all aseptic operations?
- Are your alert and action limits scientifically justified with documented rationale?
- Does your programme cover all parameters: particles, temperature, humidity, pressure differentials and air velocity?
- Are monitoring frequencies risk-based and documented?
Not sure where you stand?
A compliance gap audit assesses your monitoring programme against Annex 1 and gives you a prioritised action plan.
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