National Heat Awareness Day is observed worldwide every last Friday of May. It was launched by the National Weather Service and the Occupational Safety and Health Administration (OSHA) to educate the public about the dangers of heat-related illnesses, particularly for those who work outdoors in hot conditions. The day emphasizes the importance of hydration and recognizing the signs of heat illnesses, which can range from heat cramps to severe heat stroke. People are encouraged to take preventive measures, such as avoiding strenuous activities during peak heat hours and wearing appropriate clothing. The observance also highlights the responsibility of employers to protect outdoor workers by providing necessary resources like water and breaks. Overall, it aims to promote safety and health in high-temperature environments.