> 46.0 | extreme heat stress EHS | periodical cooling and drinking > 0.5 l·h–1 necessary; stay inactive |
38.1 – 46.0 | very strong heat stress VSHS | periodical use of air conditioning or shaded sites, and drinking > 0.5 l·h–1 necessary; reduce activity |
32.1 – 38.0 | strong heat stress SHS | drinking > 0.25 l·h–1 necessary; keep to shady places and reduce activity |
26.1 – 32.0 | moderate heat stress MHS | drinking > 0.25 l·h–1 necessary |
9.1 – 26.0 | thermoneutral zone TZ | physiological thermoregulation sufficient to stay comfortable |
0.1 – 9.0 | slight cold stress SlCS | use gloves and cap |
–12.9 – 0.0 | moderate cold stress MCS | increase activity; protect extremities and face against cooling |
–26.9 – –13.0 | strong cold stress SCS | strongly increase activity; protect face and extremities; use better insulated clothing |
–39.9 – –27.0 | very strong cold stress VSCS | strongly increase activity; clothing; protect reduce face and time extremities; outdoors use better insulated |
≤ –40.0 | extreme cold stress ECS | stay indoors or use heavy, wind-protective clothing |