• Extreme Heat
  U.S. Environmental Protection Agency
• Fact Sheet – Extreme Heat (PDF, 107 KB)
  Federal Emergency Management Agency, U.S. Department of Homeland Security
• Heat: A Major Killer
  Office of Climate, Water, and Weather Services, National Weather Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
• Heat Index
  Weather Forecast Office, National Weather Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
• Maximum Heat Index Forecasts
  National Weather Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce
• Preparedness Fast Facts: Heat Waves
  American Red Cross

• Communicating the Health Risks of Extreme Heat Events (PDF, 1.84 MB)
  Health Canada
• Extreme Heat
  Centers for Disease Control and Prevention, U.S. Department of Health and Human Services
• Air Quality Index (AQI) - A Guide to Air Quality and Your Health
  AIRNow Partners
• Management of Heatstroke and Heat Exhaustion
  American Family Physician. 2005 Jun 1;71(11):2133-2140
• A Guide to the UV Index
  U.S. Environmental Protection Agency
• Medical Aspects of Harsh Environments, Volume 1
  U.S. Army Medical Department

• Adapting to Extreme Heat Events: Guidelines for Assessing Health Vulnerability (PDF, 2.87 MB)
  Health Canada
• Excessive Heat Events Guidebook (PDF, 709.64 KB)
  U.S. Environmental Protection Agency
• Extreme Heat Events
  Minnesota Department of Health
• Heatwave Planning Guide: Development of Heatwave Plans in Local Councils in Victoria (PDF, 1.84 MB)
  Victorian Government Department of Human Services, Environmental Health Unit, Rural and Regional Health and Aged Care Services Division
• Improving Public Health Responses to Extreme Weather/Heat Waves - EuroHEAT (PDF, 1.54 MB)
  World Health Organization, Regional Office for Europe
• Preparing for and Responding to Extreme Heat and Cold Events
  Centers for Disease Control and Prevention, U.S. Department of Health and Human Services
• Public Health Advice on Preventing Health Effects of Heat: New and Updated Information for Different Audiences (PDF, 2.1 MB)
  World Health Organization, Regional Office for Europe

• Heat Safety Tool
  App for Android, Blackberry and iPhone.
  Occupational Safety and Health Administration, U.S. Department of Labor
• Working in Hot Environments
  National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, U.S. Department of Health and Human Services
• Heat Stress
  National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, U.S. Department of Health and Human Services
• OSHA's Campaign to Prevent Heat Illness in Outdoor Workers
  Occupational Safety and Health Administration, U.S. Department of Labor
• Using the Heat Index
  Occupational Safety and Health Administration, U.S. Department of Labor
• UV Radiation
  National Institute for Occupational Safety and Health, Centers for Disease Control and Prevention, U.S. Department of Health and Human Services

Children

• Extreme Heat: Effects on Children and Pregnant Women
  U.S. Environmental Protection Agency

Older Adults

• Aging Initiative: Extreme Heat Events
  U.S. Environmental Protection Agency
• Hyperthermia: Too Hot for Your Health
  National Institute on Aging, National Institutes of Health, U.S. Department of Health and Human Services
• Heat Stress and the Elderly
  Centers for Disease Control and Prevention, U.S. Department of Health and Human Services

• Heat Illness
  MedlinePlus, U.S. National Library of Medicine, National Institutes of Health, U.S. Department of Health and Human Services
• Extreme Heat
  Ready.gov, Federal Emergency Management Agency, U.S. Department of Homeland Security
• Extreme Heat: A Prevention Guide to Promote Your Personal Health and Safety
  Centers for Disease Control and Prevention, U.S. Department of Health and Human Services

Spanish

• Calor Extremo (Extreme Heat)
  Centers for Disease Control and Prevention, U.S. Department of Health and Human Services
• Calor Extremo (Extreme Heat)
  Listo.gov, Federal Emergency Management Agency, U.S. Department of Homeland Security
• Manténgase fresco cuando hace mucho calor (Keep Your Cool in Hot Weather)
  Centers for Disease Control and Prevention, U.S. Department of Health and Human Services
• OSHA para prevenir las enfermedades a causa del calor en trabajadores al aire libre (OSHA’s Campaign to Prevent Heat Illness in Outdoor Workers)
  Occupational Safety and Health Administration, U.S. Department of Labor

• Animals in Disasters
  U.S. National Library of Medicine, National Institutes of Health, U.S. Department of Health and Human Services
• Excessive Heat and Your Pets and Livestock
  Center for Food Security & Public Health, Iowa State University