SHRAM: System for Heat Risk Assessment for Manual labor

Beta version — data and features may change.

Current Heat Stress Alerts MET LEVEL CONDITIONS STATE

All India

DISTRICT

All Districts

MET Level: Select based on work intensity.
• EHI-3: Light (e.g. light work)
• EHI-4: Moderate (e.g. carrying loads)
• EHI-5: Heavy (e.g. construction work)
• EHI-6: Very Heavy (e.g. agricultural work)

Sun Exposure:
• Shade: Working under cover or indoors
• Sun: Direct sunlight exposure

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EHI-N* zones computed from IMD station observations

Heat Stress Forecast MET LEVEL CONDITIONS FORECAST MET Level: Select based on work intensity.
• EHI-3: Light (e.g. light work)
• EHI-4: Moderate (e.g. carrying loads)
• EHI-5: Heavy (e.g. construction work)
• EHI-6: Very Heavy (e.g. agricultural work)

Sun Exposure:
• Shade: Working under cover or indoors
• Sun: Direct sunlight exposure

Click on a state to select it:

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Data source: Open-Meteo | Methodology

Historical Zones TIMEFRAME MET LEVEL CONDITIONS STATE

All India

DISTRICT MET Level: Select based on work intensity.
• EHI-3: Light (e.g. light work)
• EHI-4: Moderate (e.g. carrying loads)
• EHI-5: Heavy (e.g. construction work)
• EHI-6: Very Heavy (e.g. agricultural work)

Sun Exposure:
• Shade: Working under cover or indoors
• Sun: Direct sunlight exposure

Historical Zones

Dry-Bulb Temperature & Relative Humidity

Data source: India Meteorological Department (IMD)

Calculate EHI-N*

Temperature

Relative Humidity (%)

Solar Exposure

Select Activity Level (METs)

3 METs

Light Work

4 METs

Moderate Work

5 METs

Heavy Work

6 METs

Very Heavy

About EHI-N*

The Extended Heat Index for Laboring Populations (EHI-N*) is a physiologically-based heat stress metric designed to assess thermal stress in labor-intensive occupations.

EHI-N* Nomenclature: N indicates metabolic rate (3-6+ METs), * indicates sun exposure

References

Heat Stress Zones

EHI-N* classifies heat stress into zones based on physiological risk:

Zone 1: Hypothermia (Severe Cold Stress)

Physiological State: Fractional skin coverage provides sufficient control.

Characteristics: The body can maintain thermal equilibrium through minimal adjustments to skin blood flow and clothing.

Zone 2: Comfortable (Thermoneutral)

Physiological State: Clothing adjustment in warm conditions.

Characteristics: Increased skin blood flow while maintaining comfortable clothing levels.

Zone 3: Warm (Mild Heat)

Physiological State: Minimal clothing for enhanced evaporative cooling.

Characteristics: Maximum skin blood flow with minimal clothing to maximize heat dissipation.

Zone 4: Hot (Elevated Risk)

Physiological State: Cutaneous blood flow becomes limiting.

Characteristics: Skin blood flow reaches maximum capacity. The body relies primarily on sweating for heat dissipation.

Recommendations: Frequent breaks and hydration needed. Monitor workers closely.

Zone 5: Very Hot (Cardiovascular Stress)

Physiological State: Skin saturated with sweat - dripping occurs.

Characteristics: Maximum sweating rate achieved. Sweat drips off skin without evaporating, reducing cooling efficiency.

Recommendations: Limit heavy work. Increase rest periods. Ensure continuous hydration and access to shade.

Zone 6: Hyperthermia (Severe Heat Stress)

Physiological State: Core temperature rising - Heat production exceeds dissipation capacity.

Characteristics: All thermoregulatory mechanisms exhausted. Core body temperature is actively increasing, leading to heat illness.

HAZARDOUS - IMMEDIATE ACTION REQUIRED: Cease work immediately. Move to cool environment. Seek medical attention. Risk of heat stroke and organ damage.

Contact

India Energy & Climate Center (IECC)
University of California, Berkeley

Developed by Elif Kılıç
Design by Fernando Augusto
Project direction by Ashok Gadgil

iecc@berkeley.edu
iecc.gspp.berkeley.edu

Underlying data files are available on request — email us.

Forecast Methodology

Data Source

Forecast Periods

EHI-N* Calculation

MET Levels

Sun Exposure

Zone Classification