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Spot PSI Values from Humidity vs Visibility

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

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Spot PSI Values from Humidity vs Visibility

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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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