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iotDashboard/services/gpt_service/METRICS_REFERENCE.md

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# Environmental Monitoring Standards Reference
This document provides the industry-standard optimal ranges used by the GPT service for environmental analysis.
## Supported Metrics
### Temperature (°C)
- **Optimal Range**: 18-24°C
- **Comfort Zone**: 20-22°C
- **Critical Low**: <15°C
- **Critical High**: >28°C
- **Standards**: ASHRAE 55, ISO 7730
- **Key Concerns**:
- Worker comfort and productivity
- Equipment operating conditions
- Energy efficiency
- HVAC system performance
### Humidity (%)
- **Optimal Range**: 30-60%
- **Comfort Zone**: 40-50%
- **Critical Low**: <20%
- **Critical High**: >70%
- **Standards**: ASHRAE 55, WHO guidelines
- **Key Concerns**:
- Mold and mildew growth (>60%)
- Static electricity and equipment damage (<30%)
- Respiratory health and comfort
- Material degradation
### CO2 (ppm)
- **Optimal Range**: 400-1000ppm
- **Comfort Zone**: 400-800ppm
- **Critical Low**: <350ppm (unusual indoors)
- **Critical High**: >1500ppm
- **Standards**: ASHRAE 62.1, WHO Air Quality Guidelines
- **Key Concerns**:
- Air quality and ventilation effectiveness
- Cognitive performance (>1000ppm affects decision-making)
- Occupant health and alertness
- HVAC system efficiency
- **Impact**: Studies show 15% decline in cognitive function at 1400ppm
### Atmospheric Pressure (hPa)
- **Optimal Range**: 1013-1023hPa
- **Comfort Zone**: 1013-1020hPa
- **Critical Low**: <980hPa
- **Critical High**: >1050hPa
- **Key Concerns**:
- Weather changes and ventilation
- Building pressurization
- Equipment calibration
- Occupant comfort
### Light / Illuminance (lux)
- **Optimal Range**: 300-500 lux
- **Comfort Zone**: 400-500 lux
- **Critical Low**: <200 lux
- **Critical High**: >1000 lux
- **Standards**: EN 12464-1, IESNA recommendations
- **Key Concerns**:
- Visual comfort and eye strain
- Productivity and task performance
- Energy consumption
- Circadian rhythm regulation
- **Note**: Higher levels (750-1000 lux) for detailed work
### Noise (dB)
- **Optimal Range**: 30-50dB
- **Comfort Zone**: 35-45dB
- **Critical Low**: <20dB (unusual indoors)
- **Critical High**: >70dB
- **Standards**: WHO Noise Guidelines, OSHA
- **Key Concerns**:
- Acoustic comfort and concentration
- Speech intelligibility
- Stress and productivity impact
- Hearing protection requirements (>85dB)
- **Impact**: 40-45dB ideal for office work, <35dB for focused tasks
### PM2.5 - Fine Particulate Matter (µg/m³)
- **Optimal Range**: 0-12 µg/m³
- **Comfort Zone**: 0-10 µg/m³
- **Critical Low**: 0 µg/m³ (best)
- **Critical High**: >35 µg/m³
- **Standards**: EPA Air Quality Index, WHO guidelines
- **Key Concerns**:
- Air quality and health risk
- Respiratory system impact
- Filter maintenance requirements
- Outdoor air quality correlation
- **Impact**: >35 µg/m³ = Unhealthy for sensitive groups
### VOC - Volatile Organic Compounds (ppb)
- **Optimal Range**: 0-220ppb
- **Comfort Zone**: 0-150ppb
- **Critical Low**: 0ppb (best)
- **Critical High**: >500ppb
- **Standards**: Various indoor air quality standards
- **Key Concerns**:
- Indoor air quality
- Off-gassing from materials
- Ventilation effectiveness
- Occupant health symptoms (headaches, irritation)
## Analysis Approach
The GPT service uses these standards to:
1. **Assess Current Conditions**: Compare measurements against optimal ranges
2. **Identify Issues**: Flag deviations with severity levels
3. **Provide Context**: Explain health/productivity impacts
4. **Recommend Actions**: Suggest specific interventions (HVAC, ventilation, etc.)
5. **Predict Trends**: Forecast potential issues based on patterns
## Multi-Metric Correlation
When analyzing multiple metrics together, the service looks for:
- **HVAC Performance**: Temperature + Humidity + CO2 trends
- **Ventilation Effectiveness**: CO2 + PM2.5 + VOC levels
- **Occupancy Impact**: CO2 rise + Temperature increase + Humidity changes
- **Seasonal Patterns**: Pressure + Temperature + Humidity correlations
## References
- ASHRAE Standard 55: Thermal Environmental Conditions for Human Occupancy
- ASHRAE Standard 62.1: Ventilation for Acceptable Indoor Air Quality
- WHO Air Quality Guidelines
- ISO 7730: Ergonomics of the thermal environment
- EN 12464-1: Light and lighting of work places
- EPA Air Quality Index
- OSHA Occupational Noise Exposure Standards
## Usage in Prompts
The service automatically includes relevant standards in analysis prompts based on detected metrics. No manual configuration needed - just send your telemetry data!