Atmospheric & Weather Scales
- U.S. Environmental Protection Acid Rain pH Scale: U.S. Environmental Protection Agency (EPA)
- North America Avalanche Danger Scale: National Avalanche Center (NAC) / Avalanche Canada
- North Indian Ocean Tropical Cyclone Intensity Scale: India Meteorological Department (IMD)
- Pandemic Severity Index (PSI) Scale: U.S. Centers for Disease Control and Prevention (CDC)
- Palmer Drought Severity Index (PDSI) Scale: National Center for Atmospheric Research (NCAR)
- Torro International Hailstorm Intensity Scale: Tornado and Storm Research Organisation (TORRO)
- Air Quality Index (AQI) Haze Scale: U.S. Environmental Protection Agency (EPA)
- The Heat Index Heatwave Scale: National Weather Service (NWS)
- Saffir-Simpson Hurricane Scale: National Hurricane Center (NHC) / NOAA
Severe Storms & Regional Scales
- CMA Sandstorm/Dust Storm Scale: China Meteorological Administration (CMA)
- The NOAA Solar Flares/Storm Scale: NOAA Space Weather Prediction Center (SWPC)
- The Super Fog (AFI) Scale: U.S. Forest Service (USFS) / Southern Research Station [Achtemeier, FI]
- The Enhanced Fujita (EF) Tornado Scale: Wind Science and Engineering Research Center / NOAA
- The Tsunami Alerts Scale: National Tsunami Warning Center (NTWC) / NOAA
- The CMA Typhoon Scale: China Meteorological Administration (CMA)
- Winter Storm Severity Index (WSSI): National Weather Service (NWS)
- Northeast Snowfall Impact Scale (NESIS): National Centers for Environmental Information (NCEI)
Geological, Ecological & Humanitarian Scales
- The Richter Earthquake Scale: California Institute of Technology (Caltech)
- Sussex Magnitude Famine Scale: Institute of Development Studies (IDS), University of Sussex [Howe & Devereux]
- Volcanic Explosivity Index (VEI): United States Geological Survey (USGS) / Smithsonian Institution
- Forest Fire Danger Index (FFDI) Wildfire Scale: Commonwealth Scientific and Industrial Research Organisation (CSIRO)