Employers are responsible for protecting workers from temperature extremes and should establish a complete heat illness prevention program if workers are exposed to conditions that can cause heat illness. Elements of an effective program include: providing workers with water, rest and shade; gradually increasing workloads and allow more frequent breaks for new workers to build a tolerance for working in the heat (acclimatization); modify work schedules as necessary; plan for emergencies and train workers about the symptoms of heat-related illnesses and their prevention; and monitor workers for signs of illness. For more information see OSHA's Heat Illness Prevention Campaign page.