Heat and Air Quality
Why People Get This Wrong
People often assume that the heat index alone determines when cooling breaks are mandatory, forgetting about WBGT entirely. The confusion arises because the official rule specifies both temperature and humidity (WBGT) must be at or above 82°F for mandatory breaks, not just the heat index. This oversight frequently leads to disputes over whether air quality is a factor in triggering these breaks.
Official Verdict
Mandatory cooling breaks apply when WBGT is at or above 82°F (27.8°C). The league applies WBGT-based heat thresholds for cooling breaks, additional water breaks, and, in extreme cases, for delays of kickoff or postponement.
