Heat index, WBGT and wind chill
CHST written lesson, 9 min read. CHST Domain 1: Hazard and Risk Identification and Control
AI-drafted from the cited rules and fact-checked against them. Study aid, not site-specific safety advice. The official rule controls.
What you'll learn
- Compute indoor WBGT from natural wet bulb and globe temperature
- Compute outdoor WBGT using the air temperature term
- Choose the correct WBGT formula for the work setting
- Explain how the NWS heat index is calculated and when the regression applies
- Calculate wind chill from air temperature in °F and wind speed in mph
What this lesson covers
This lesson covers three environmental stress formulas: indoor and outdoor WBGT, the NWS heat index regression, and wind chill. Knowing which formula applies and which inputs and units it needs wins these exam questions and keeps job assessments correct.
This lesson is included with a pass
Written lessons come with every CHST pass, along with the video lessons, the question bank, mocks and the tutor. $80 per exam or $143 for all three, for 180 days.
Try the free heat index, wbgt and wind chill practice questions