1. Purpose
To establish a robust and systematic procedure for monitoring, controlling, and maintaining temperature and humidity within specified limits in manufacturing, storage, and laboratory areas.
This SOP ensures product quality, regulatory compliance, equipment reliability, and environmental stability in accordance with Good Manufacturing Practices (GMP) and quality management requirements.
2. Scope
This procedure applies to all temperature and humidity-controlled areas, including but not limited to:
- Production areas
- Raw material and finished goods warehouses
- Quality control laboratories
- Stability chambers
- Cleanrooms and controlled environments
- Cold rooms and refrigerators
- Data centers and critical equipment rooms
This SOP covers monitoring, recording, alarm management, deviation handling, and corrective actions related to environmental conditions.
3. Objective
The objective of this SOP is to:
- Maintain environmental conditions within defined limits
- Protect temperature-sensitive materials and products
- Ensure regulatory compliance and audit readiness
- Prevent product degradation and quality failures
- Establish real-time monitoring and response mechanisms
4. Definitions
Temperature:
The degree of heat maintained within a controlled environment, measured in °C or °F.
Relative Humidity (RH):
The amount of moisture present in the air compared to the maximum amount the air can hold at that temperature, expressed as a percentage (%).
Environmental Monitoring System (EMS):
An automated system used to monitor, record, and alert deviations in environmental parameters.
Excursion:
A temporary deviation of temperature or humidity beyond the predefined acceptable limits.
Alarm System:
A notification mechanism that alerts responsible personnel when environmental conditions exceed defined limits.
5. Responsibilities
Quality Assurance (QA)
- Approve environmental control procedures
- Review monitoring records and deviations
- Ensure compliance with GMP requirements
- Approve corrective and preventive actions (CAPA)
Engineering / Maintenance
- Install and maintain monitoring equipment
- Calibrate temperature and humidity sensors
- Respond to alarms and equipment failures
Warehouse / Production Personnel
- Monitor environmental conditions regularly
- Record temperature and humidity readings
- Report deviations immediately
Quality Control (QC)
- Monitor environmental conditions in laboratories
- Ensure stability chambers operate within limits
6. Environmental Control Requirements
Environmental conditions must be maintained according to validated limits for each area.
| Area | Temperature Range | Humidity Range |
|---|---|---|
| Warehouse | 15°C – 25°C | ≤ 60% RH |
| Production Area | 20°C – 25°C | 40 – 60% RH |
| QC Laboratory | 20°C – 25°C | 40 – 60% RH |
| Cold Room | 2°C – 8°C | Controlled |
| Stability Chambers | As per study protocol | As per study protocol |
Limits must be defined in area-specific environmental specifications.
7. Monitoring System
Temperature and humidity shall be monitored using:
- Digital temperature sensors
- Data loggers
- Environmental Monitoring Systems (EMS)
- Manual thermohygrometers (backup)
Monitoring may be:
- Continuous (automated system)
- Periodic manual monitoring (minimum twice daily)
All monitoring devices must be calibrated and traceable to national standards.
8. Procedure
8.1 Installation of Monitoring Devices
- Install sensors at representative locations identified during environmental mapping.
- Avoid placing sensors near:
- Air vents
- Doors
- Direct sunlight
- Heat-generating equipment
- Ensure proper labeling and identification of each monitoring device.
8.2 Environmental Mapping
- Conduct temperature and humidity mapping studies before using new storage areas.
- Mapping should be performed:
- During summer and winter conditions
- After major structural or HVAC changes
- Identify hot spots and cold spots and adjust sensor placement accordingly.
8.3 Routine Monitoring
- Record temperature and humidity readings:
- At the start and end of each shift, or
- As defined in the monitoring schedule.
- Ensure readings remain within approved limits.
- Document observations in environmental monitoring logs.
8.4 Alarm Management
If environmental conditions exceed defined limits:
- The monitoring system will trigger an alarm notification.
- Responsible personnel must immediately:
- Investigate the cause
- Inform QA and maintenance
- Corrective actions may include:
- Adjusting HVAC systems
- Repairing faulty sensors
- Relocating materials if necessary
8.5 Handling Temperature/Humidity Excursions
When excursions occur:
- Record details in the Deviation Report.
- Assess potential impact on:
- Raw materials
- In-process materials
- Finished products
- QA must perform risk assessment and determine product disposition.
Possible actions include:
- Product release after evaluation
- Additional testing
- Product quarantine
- Product rejection
8.6 Calibration of Monitoring Devices
All monitoring equipment must be calibrated:
- At least once per year
- After repair or relocation
- According to calibration schedule
Calibration records must be maintained and reviewed by QA.
8.7 Documentation
Maintain the following records:
- Temperature monitoring logs
- Humidity monitoring logs
- Environmental mapping reports
- Alarm and deviation reports
- Calibration certificates
- Corrective action reports
All records must comply with data integrity principles (ALCOA+).
9. Precautions
- Do not block airflow around sensors.
- Ensure doors remain closed in controlled areas.
- Avoid frequent opening of cold storage areas.
- Immediately report abnormal readings.
10. Deviations and Corrective Actions
Any deviation from the specified temperature or humidity range must be:
- Documented through the Deviation Management System
- Investigated to identify the root cause
- Addressed through Corrective and Preventive Actions (CAPA)
QA must review and approve all deviation closures.
11. Training
All personnel involved in environmental monitoring must receive training on:
- Temperature and humidity control requirements
- Monitoring procedures
- Alarm response protocols
- Documentation practices
Training records must be maintained.
12. References
- Good Manufacturing Practices (GMP) Guidelines
- WHO Technical Report Series for Pharmaceutical Storage
- ICH Guidelines for Stability Studies
- Internal Quality Management System Procedures
13. Attachments / Forms
- Temperature Monitoring Log Sheet
- Humidity Monitoring Log Sheet
- Environmental Deviation Report
- Environmental Mapping Report
- Calibration Record Template
FAQs: Temperature and Humidity Control SOP
1. Why is temperature and humidity control important in pharmaceutical facilities?
Temperature and humidity control is critical in pharmaceutical facilities to maintain product stability, ensure drug quality, prevent degradation, and comply with Good Manufacturing Practices (GMP) requirements.
2. What is the ideal temperature range for pharmaceutical storage?
The typical controlled room temperature for pharmaceutical storage is 15°C to 25°C, unless otherwise specified by product stability data or regulatory guidelines.
3. What is the acceptable humidity range in pharmaceutical environments?
Most pharmaceutical manufacturing and storage areas maintain relative humidity between 40% and 60% RH, though specific products may require different humidity limits.
4. What equipment is used to monitor temperature and humidity?
Common monitoring equipment includes:
- Digital thermometers
- Hygrometers
- Data loggers
- Environmental Monitoring Systems (EMS)
- Thermohygrometers
These devices provide continuous or periodic monitoring of environmental conditions.
5. What is an environmental monitoring system (EMS)?
An Environmental Monitoring System (EMS) is an automated system that continuously tracks temperature and humidity levels, records data, and triggers alerts if conditions exceed predefined limits.
6. How often should temperature and humidity be monitored?
Monitoring frequency depends on the facility setup:
- Continuous monitoring using automated systems
- Manual monitoring at least twice daily in controlled areas
Critical areas like cold rooms or stability chambers typically require continuous monitoring.
7. What is a temperature or humidity excursion?
A temperature or humidity excursion occurs when environmental conditions temporarily exceed the predefined acceptable limits, potentially affecting product quality or stability.
8. What should be done if a temperature excursion occurs?
If a temperature excursion occurs:
- Immediately notify responsible personnel
- Investigate the root cause
- Record the deviation
- Perform product impact assessment
- Implement corrective actions
Quality Assurance must review and approve the investigation.
9. What is environmental mapping?
Environmental mapping is a scientific study conducted to evaluate temperature and humidity distribution within a controlled area to identify hot spots, cold spots, and ideal sensor locations.
10. When should temperature mapping be performed?
Temperature and humidity mapping should be conducted:
- Before using a new storage area
- After HVAC modifications
- After structural changes
- Periodically as part of validation
Mapping helps ensure uniform environmental conditions.
11. Why is calibration of monitoring devices necessary?
Calibration ensures that temperature and humidity monitoring devices provide accurate and reliable measurements, which is essential for regulatory compliance and product quality assurance.
12. How frequently should monitoring devices be calibrated?
Monitoring devices are generally calibrated:
- At least once per year
- After repairs
- After relocation
- According to the calibration schedule
13. What role does HVAC play in environmental control?
HVAC (Heating, Ventilation, and Air Conditioning) systems regulate temperature, humidity, airflow, and air quality within pharmaceutical facilities to maintain controlled environmental conditions.
14. What are the risks of poor temperature and humidity control?
Poor environmental control can lead to:
- Product degradation
- Reduced drug potency
- Microbial growth
- Stability failures
- Regulatory non-compliance
15. What records must be maintained for temperature and humidity monitoring?
Facilities should maintain records such as:
- Temperature logs
- Humidity logs
- Environmental mapping reports
- Alarm reports
- Deviation reports
- Calibration certificates
These records support regulatory audits and quality assurance.
16. Who is responsible for monitoring temperature and humidity?
Responsibilities are typically shared among:
- Production personnel
- Warehouse staff
- Engineering or maintenance teams
- Quality control laboratories
- Quality assurance department
17. What is relative humidity (RH)?
Relative humidity is the percentage of moisture in the air compared to the maximum moisture the air can hold at a specific temperature.
18. How can temperature fluctuations be minimized in storage areas?
Temperature fluctuations can be minimized by:
- Maintaining proper HVAC operation
- Reducing door opening frequency
- Installing alarm systems
- Using insulated storage areas
- Conducting regular maintenance
19. What should be included in a temperature and humidity SOP?
A comprehensive SOP should include:
- Purpose and scope
- Monitoring procedures
- Equipment requirements
- Alarm management
- Deviation handling
- Calibration requirements
- Documentation guidelines
20. How does temperature and humidity control support GMP compliance?
Maintaining controlled environmental conditions ensures:
- Drug product stability
- Consistent manufacturing processes
- Regulatory compliance
- Patient safety
This is a fundamental requirement under Good Manufacturing Practices (GMP) regulations.
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