A construction crew is pouring concrete in direct sunlight. A safety officer takes the following readings: Natural Wet Bulb Temperature ($T_{\text{nwb}}$) = $24^\circ\text{C}$ (indicates high humidity). Black Globe Temperature ($T_g$) = $35^\circ\text{C}$ (indicates intense solar radiation). Dry Bulb Temperature ($T_d$) = $30^\circ\text{C}$ (actual air temp). Calculate the outdoor WBGT.

A welding crew is working inside an unventilated steel tank. There is no direct solar radiation, but the arc generates heat. Readings: $T_{\text{nwb}} = 28^\circ\text{C}$, $T_g = 32^\circ\text{C}$. Calculate the indoor WBGT.

An ironworker is erecting steel at an air temperature of $15^\circ\text{F}$ ($-9^\circ\text{C}$) with a steady wind speed of 30 mph on the top floor of a high-rise. The National Weather Service Wind Chill formula yields an equivalent temperature of $-5^\circ\text{F}$ ($-20^\circ\text{C}$). Determine the primary hazard and required controls.

A contractor in Arizona hires a new worker who recently moved from Alaska. On the first day of work in July ($105^\circ\text{F}$), the worker is assigned to continuously haul 80-pound bags of cement. By 2:00 PM, the worker stops sweating, their skin becomes hot and dry, they become severely confused, and they collapse into a seizure.

During a massive summer concrete pour, a crew drinks gallons of plain water throughout the 12-hour shift. Late in the day, several workers begin experiencing incredibly painful, debilitating muscle spasms in their legs and abdomen, forcing work to halt.