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<br />25 <br /> <br />Thermal Stress Monitoring <br /> <br />When permeable work clothes are worn (street clothes or clothing ensembles over street <br />clothes), physiological monitoring may be required. Regularly observe workers for signs and <br />symptoms of heat stress and implement physiological monitoring as indicated below. This should <br />start when the heat index reaches 80°F (27°C) [see Heat Index Table below], or sooner if workers <br />exhibit symptoms of heat stress indicated in the table above. These heat index values were <br />devised for shady, light wind conditions; exposure to full sunshine can increase the values by up <br />to 15°F (8°C). Also, strong winds, particularly with very hot, dry air, can be highly hazardous. <br /> <br />Heat Index Possible Heat Disorders Minimum Frequency of <br />Physiological Monitoring <br />80°F - 90°F <br />(27°C - 32°C) <br />Fatigue possible with prolonged <br />exposure and/or physical activity <br />Observe Workers for signs <br />of heat stress and <br />implement physiological <br />monitoring if warranted. <br />90°F - 105°F <br />(32°C - 41°C) <br />Sunstroke, heat cramps, or heat <br />exhaustion possible with <br />prolonged exposure and/or <br />physical activity <br />Every 2 hours, or sooner, if <br />signs of heat stress are <br />observed.