The current and proposed policies contain the following elements:
1. Use of a WBGT instrument to determine risk to employees and visitors. Three risk
levels are defined using the heat index measurement obtained from the WBGT. These
risk levels guide the frequency of employee “self-monitoring” as follows:
Level One: WBGT heat index > 76°F — Risk of heat-related illness present
→ employees should self-monitor every hour.
Level Two: WBGT heat index > 82°F — High risk of heat-related illness
present → employees should self-monitor every half hour.
Level Three: WBGT heat index > 90°F — Extreme risk of heat-related
illness present → employees should self-monitor every quarter hour.