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Visibility Guidelines and PSI Values for Safety at Work

This guide provides visibility guidelines based on PSI values for different humidity levels. It offers working limitations and recommended PPE for workers depending on PSI range. Stay safe and informed at work.

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Visibility Guidelines and PSI Values for Safety at Work

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  1. Morning Afternoon Land : 95% 75% Sea : 80% 85% Spot PSI Values from Humidity vs Visibility April 1998 - KB/Seria Visibility - km’s 5.0km 3.0km 2.0km 1.0km 0.5km 0.2km 0.1km 70% 74 106 146 380 >800 >1500 >3000 80% 61 85 114 209 >600 >1200 >2500 85% 54 73 97 168 472 >1000 >2000 90% 42 60 78 131 300 >800 >1500 95% 25 42 56 87 149 510 >1000 Relative Humidity - % HUMIDITY Spot PSI of 100 - visibility on humid morning <1 km - visibility in late afternoon 3 km

  2. WORKING GUIDELINES Outside ReadingRECOMMENDED PPE AND WORK LIMITATIONS (Version 1,2/4/1998) Spot PSI Inside Office / Outside Workers Level Building with A/C PPE Advise max PPE Advised max exposure hours exposure hours 0 - 50 None No Restriction None No Restriction 51 - 100 None No Restriction None No Restriction 101 - 200 None No Restriction Mask 8 Hours 201 - 300 None No Restriction Mask 6 Hours 301 - 400 Individual choice No Restriction Mask 4 Hours 401 - 500 Individual choice No Restriction Mask 2 Hours

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