Laserfiche WebLink
Heat Stress Index <br />Temp. <br />°F <br />Relative Humidity <br />10% 20% 30% 40% 50% 60% 70% 80% 90% <br />105 98 104 132 <br />132 <br />4111i <br />102 97 101 <br />100 95 99 105 <br />98 93 97 101 <br />96 1 91 95 98 104 <br />94 89 93 95 100 105 <br />92 87 90 92 96 100 <br />90 85 88 90 92 96 100 <br />88 82 86 87 89 93 95 100 <br />86 80 84 85 87 90 92 96 100 <br />84 r-7881 83 85 86 89 91 95 99 <br />82 or 79 80 81 84 86 89 91 95 <br />80 75 77 78 79 81 83 85 86 89 <br />78 72 76 77 78 79 80 81 83 85 <br />76 - 70 72 75 76 77 77 77 78 79 <br />74 1 68 70 73 74 75 75 75 76 77 <br />NOTES: Add 10° F when protective clothing is being used; Add 10° F when in direct sunlight <br />HSI <br />Temp Category Injury Threat <br />Above <br />130° F <br />Extreme <br />Danger <br />No work unless emergency exists. Contact ATC RSC and Corporate Risk <br />Management Department prior to proceeding. Heat cramps or exhaustion likely, <br />heat stroke possible if exposure is prolonged and there is physical activity. <br />Danger Contact RSC prior to proceeding. Requires strict adherence to ACGIH Heat Stress <br />Guidelines, including use of on-site WBGT equipment. Heat cramps or exhaustion <br />likely, heat stroke possible if exposure is prolonged and there is physical activity. <br />90° to <br />105° F <br />Extreme <br />Caution <br />Heat cramps or exhaustion likely, heat stroke possible if exposure is prolonged and <br />there is physical activity. <br />80° to <br />90° F <br />Caution Heat cramps or exhaustion likely, heat stroke possible if exposure is prolonged and <br />there is physical activity. <br />Below <br />80° F <br />Normal <br />Range <br />Typical conditions for time of year. Little or no danger under normal circumstances. <br />As always, anticipate problems and work safely. <br />HASP Farmer 2017 5-2 <br />9/19/17