iotDashboard/services/gpt_service/METRICS_REFERENCE.md

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!