What flag color represents the temperature range 85-87.9°F?

• A. Green
• B. Yellow
• C. Red
• D. Blue

Answer: (B)

Color-coded flag systems use a simple, rapid signal to convey how environmental temperature should be managed. Green means everything is within a comfortable, safe range. Red indicates a danger zone where actions to prevent heat-related illness are required. Blue signals cool or chilly conditions. Yellow sits in between—it's a caution zone for warm conditions that warrant increased awareness and possibly preventive steps, but not an immediate emergency.

The temperature range 85–87.9°F is warm enough to merit caution and monitoring, yet not extreme enough to demand red-level actions. That’s why yellow is the best fit: it flags the need to stay alert, hydrate, provide shade or ventilation, and watch for signs of heat stress, without signaling an urgent danger.