Bangladesh Heat Stress Index (WBGT) — Heatwave & Outdoor Safety Alerts
Real-time wet-bulb globe temperature (WBGT) and heatwave alerts for all 64 districts of Bangladesh. Safe work schedules and heatstroke prevention guide for outdoor workers, farmers, and construction laborers.
Nationwide Outdoor Labor & Thermal Safety Evaluation
High humidity coupled with direct solar radiation pushes peak WBGT to 34.3°C (Extreme Danger). Outdoor manual laborers are advised to strictly adhere to mandatory rest intervals (15 min work / 45 min shade rest or suspend heavy work).
Today's Top 10 Highest WBGT Heat Stress Districts
Regional WBGT Thermal Index Breakdown
15 min work / 45 min shade rest or suspend heavy work
15 min work / 45 min shade rest or suspend heavy work
15 min work / 45 min shade rest or suspend heavy work
15 min work / 45 min shade rest or suspend heavy work
15 min work / 45 min shade rest or suspend heavy work
15 min work / 45 min shade rest or suspend heavy work
15 min work / 45 min shade rest or suspend heavy work
15 min work / 45 min shade rest or suspend heavy work
5-Day WBGT Heat Stress Forecast
5-day WBGT trajectory for planning outdoor work shifts & rest intervals in compliance with OSHA standards
Air Temperature vs. WBGT Diurnal Comparison
Diurnal thermal comparison illustrating why high ambient humidity causes WBGT heat stress to exceed normal air temperature safety limits
Between 12:00 PM and 4:00 PM, high humidity and direct solar radiation push WBGT beyond the 31.5°C threshold. Even if dry-bulb air temperature measures 34-36°C, humidity halts sweat evaporation, creating severe physiological thermal strain.
Annual Seasonal WBGT Heat Stress Cycle
Pre-monsoon heatwave danger window (Apr-May) vs monsoon mitigation across the 12 calendar months
ISO 7243 & OSHA Work-to-Rest Ratio Schedule
Continuous labor allowed; standard hydration
45 min work / 15 min shade rest per hour
30 min work / 30 min shade rest per hour
15 min work / 45 min shade rest or suspend heavy work
| WBGT Temperature Threshold | Mandatory Work-to-Rest Ratio |
|---|---|
| Normal (< 28.0°C WBGT) | Continuous labor allowed; standard hydration |
| Moderate Caution (28.0 - 29.9°C) | 45 min work / 15 min shade rest per hour |
| High Danger (30.0 - 31.4°C) | 30 min work / 30 min shade rest per hour |
| Extreme Danger (≥ 31.5°C WBGT) | 15 min work / 45 min shade rest or suspend heavy work |
Occupational Sector Heat Safety Protocols
Heatstroke Symptoms & Rapid Cooling Protocol
Core body temperature exceeding 104°F (40°C), cessation of sweating, hot dry skin, confusion, or loss of consciousness indicate medical emergency heatstroke.
IMMEDIATE FIRST AID: Move patient to shade, loosen heavy clothing, apply ice packs or cold water immersion to neck, armpits, and groin, and call emergency services (999).
Understanding Wet-Bulb Temperature (WBGT) vs Dry-Bulb Temperature
Dry-bulb thermometers measure ambient air temperature alone. However, human cooling relies on sweat evaporation, which halts when relative humidity is high. Wet-Bulb Globe Temperature (WBGT) incorporates ambient temperature, humidity, wind velocity, and solar radiation into a single thermodynamic metric determining physiological limits.