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Two days that read 35°C on a thermometer can produce wildly different WBGT values — a dry 35°C with 25% humidity might only reach 25°C WBGT (Green Flag), while a muggy 35°C at 70% humidity could push past 32°C WBGT (Black Flag).","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"That's the difference between \"stay hydrated\" and \"cancel everything.\"","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"How to Use This Calculator","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"heading","version":1,"tag":"h2"},{"children":[{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Enter dry-bulb temperature","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" — the standard air temperature from any thermometer, weather station, or weather app. Defaults to Celsius.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"listitem","version":1,"value":1},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Enter relative humidity","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" — the percentage of moisture in the air. 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For very heavy work with unacclimatized individuals, the safe limit is just 20°C — a temperature most people would call \"pleasant.\" That surprises a lot of safety managers the first time they see it. But metabolic heat generation during intense physical work is enormous, and the body's cooling system needs every advantage it can get.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"These thresholds come from the ACGIH (American Conference of Governmental Industrial Hygienists) screening criteria and assume a standard 8-hour workday with standard work clothing.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Real-World Examples","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"heading","version":1,"tag":"h2"},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Coach Rivera's Friday practice dilemma","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" Maria Rivera coaches varsity soccer in Georgia. It's the second week of August preseason. At 3 PM, the temperature reads 34°C (93°F) with 60% humidity and a globe temperature of 39°C. She runs the numbers: outdoor WBGT comes to approximately 30.8°C (87.4°F) — Red Flag. Her players are doing heavy activity, where the acclimatized limit is 26°C. She moves practice to 6:30 AM the next morning when WBGT drops to 24°C. Nobody misses a day, nobody gets sick.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Jake's first week on the site","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" Jake just started a roofing job in Phoenix. It's June. The crew lead checks WBGT: 28°C (82.4°F) — Yellow Flag for the acclimatized regulars. But Jake is unacclimatized, and at moderate-to-heavy work, his safe limit is 22.5°C. The crew puts Jake on ground duties for his first two weeks, gradually increasing his rooftop time over 10 days. Smart move — OSHA data shows that roughly 50% of outdoor heat deaths happen in a worker's first few days on the job.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"The \"it's just a warehouse\" wake-up call","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" A distribution center manager in Houston notices workers dragging through afternoon shifts in July. The warehouse has no AC, just open bay doors. Inside: 31°C, 72% humidity. She runs the indoor WBGT calculation — 29.1°C. For the moderate physical work her team does (loading, stacking, forklift operation), that exceeds the acclimatized limit of 27.8°C. She adds industrial fans, moves heavy loading to the 6 AM shift, and sets up a shaded rest station with cold water. Worker complaints drop overnight.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Factors That Shift Your WBGT","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"heading","version":1,"tag":"h2"},{"children":[{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Humidity","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" dominates. A jump from 40% to 70% at the same air temperature can push WBGT up by 5–8°C — enough to leap from Green Flag to Red.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"listitem","version":1,"value":1},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Radiant heat","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" from dark pavement, metal roofs, and industrial equipment can raise globe temperature 10–15°C above air temperature.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"listitem","version":1,"value":2},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Wind","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" helps evaporate sweat, lowering effective wet-bulb temperature. 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Don't assume 5 PM is automatically safe.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"listitem","version":1,"value":6}],"direction":null,"format":"","indent":0,"type":"list","version":1,"listType":"bullet","start":1,"tag":"ul"},{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Tips for Staying Ahead of Heat Stress","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"heading","version":1,"tag":"h2"},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Acclimatize on purpose.","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" Don't just hope people adjust. Build a formal 7–14 day ramp-up: start at 50% of normal workload in the heat and increase 10% per day. It's the single most effective heat illness prevention strategy, and it's free.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Hydrate proactively.","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" Aim for 200–300 mL (8–12 oz) every 15–20 minutes during moderate-to-heavy work in the heat. Water is usually fine for work under 2 hours. Beyond that, add electrolytes — sweat carries out sodium and potassium that water alone doesn't replace.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Schedule around the peak.","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" Move heavy tasks to before 10 AM or after 4 PM when possible. Even a 2-hour shift in timing can drop WBGT by 3–5°C.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Build real rest areas.","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" \"Take a break\" means nothing if the break area is a sunny parking lot. Rest stations need shade, airflow, and cold water — ideally at least 5°C cooler than the work environment.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Watch for the quiet ones.","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" Heat illness impairs judgment. The person most at risk often doesn't realize it. Use a buddy system and train everyone to recognize early signs: headache, confusion, nausea, heavy sweating that suddenly stops, or skin that's hot and dry.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""},{"children":[{"detail":0,"format":1,"mode":"normal","style":"","text":"Don't forget clothing.","type":"text","version":1},{"detail":0,"format":0,"mode":"normal","style":"","text":" Dark, heavy clothing increases heat absorption and reduces evaporation. Lightweight, light-colored, moisture-wicking fabrics make a measurable difference. If PPE is required, factor that into your WBGT threshold — ACGIH recommends adding 3–5°C to your WBGT reading when workers wear non-breathable coveralls.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}},"id":"69a86aa1a08b230004be99eb"}]}]}],"$L36"]}],"$L37"]}]]}]}]}]
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36:["$","div",null,{"className":"bg-white rounded-lg shadow-sm p-8","children":[["$","h2",null,{"className":"typo-large mb-6 text-mist-950","children":"Frequently Asked Questions"}],["$","div",null,{"className":"space-y-6","children":[["$","div","0",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"What does WBGT stand for?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L33",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"WBGT stands for Wet-Bulb Globe Temperature. It's a heat stress index that blends air temperature, humidity, radiant heat, and wind into one number that tells you how hard your body has to work to stay cool — not just how hot the air happens to be.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","1",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"How is WBGT different from the heat index?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L33",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"The heat index uses only air temperature and humidity, calculated for shaded, light-wind conditions. WBGT adds radiant heat and wind effects, making it far more accurate for anyone working, exercising, or training in real-world conditions. That's why every major occupational and athletic safety organization uses WBGT over the heat index.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","2",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"What WBGT is dangerous?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L33",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"It depends on what you're doing. For light office work, 30°C is the acclimatized limit. For heavy physical labor, anything above 26°C requires modified activity. As a rule of thumb: above 28°C (82°F) WBGT, start adjusting work-rest cycles. Above 31°C (88°F), only essential tasks with close monitoring.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","3",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Does OSHA require WBGT monitoring?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L33",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Not explicitly — there's no single OSHA regulation with a WBGT number in it. But OSHA's General Duty Clause requires employers to protect workers from recognized hazards, and heat is one. OSHA publishes a free WBGT calculator and recommends it as part of any heat illness prevention plan. In practice, many safety professionals use the ACGIH thresholds as their compliance benchmark. Getting caught without a heat safety program after a heat incident is an expensive lesson — OSHA penalties for serious violations can exceed $16,000 per instance.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}],["$","div","4",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Can I use this calculator without a globe thermometer?"}],"$L38"]}],"$L39","$L3a","$L3b","$L3c","$L3d"]}]]}]
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38:["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L33",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Absolutely. Without a globe temperature reading, the calculator uses dry-bulb temperature as a stand-in. You'll get a reasonable estimate that works well for indoor and shaded conditions. Just know that in direct sunlight, especially on dark surfaces, the actual WBGT could be 2–5°C higher than what the calculator shows without globe data.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]
39:["$","div","5",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"What's the difference between indoor and outdoor WBGT?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L33",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"The outdoor formula allocates 10% weight to dry-bulb temperature (capturing solar effects), while the indoor formula shifts that 10% to the globe temperature instead. Use outdoor WBGT whenever people are in direct sunlight. Use indoor WBGT for warehouses, factories, kitchens, or any shaded environment.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
3a:["$","div","6",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Why do half of outdoor heat deaths happen in a worker's first week?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L33",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Because acclimatization is a physiological process, not just \"getting used to it.\" It takes 7–14 days of progressive heat exposure for your body to increase sweat production, improve blood flow to the skin, and reduce core temperature rise. New workers and anyone returning from time off are at dramatically higher risk. This is why formal acclimatization protocols save lives.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
3b:["$","div","7",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"What is wet-bulb depression and why does it matter?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L33",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"It's the gap between your dry-bulb and wet-bulb temperatures. Think of it as a measure of the air's \"drying power.\" A large depression (say 15°C) means the air is dry and sweat evaporates easily — your body can cool itself. A small depression (3–4°C) means the air is nearly saturated and evaporative cooling barely works. When wet-bulb depression is small, heat stress risk spikes even if the thermometer doesn't look alarming.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
3c:["$","div","8",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"How long does acclimatization last?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L33",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Most of it fades after 1–2 weeks away from heat exposure. A week-long vacation, a string of cool weather, or even switching to an air-conditioned work assignment can erode your body's adaptations. When returning to heat after a break, restart the acclimatization ramp at about 50% and build back up over several days.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]
3d:["$","div","9",{"className":"pb-6 last:pb-0","children":[["$","h3",null,{"className":"text-lg font-medium text-mist-950 mb-3","children":"Is WBGT useful in humid climates even when temperatures are moderate?"}],["$","div",null,{"className":"prose max-w-none text-mist-600","children":["$","$L33",null,{"content":{"root":{"children":[{"children":[{"detail":0,"format":0,"mode":"normal","style":"","text":"Very much so. This is actually where WBGT provides the most value over a standard thermometer. A \"mild\" 28°C (82°F) day with 85% humidity produces a WBGT that can exceed safe thresholds for heavy work. In tropical and Gulf Coast climates, moderate temperatures with high humidity are responsible for more heat illness than dramatic heat waves — because people underestimate the risk.","type":"text","version":1}],"direction":null,"format":"","indent":0,"type":"paragraph","version":1,"textFormat":0,"textStyle":""}],"direction":null,"format":"","indent":0,"type":"root","version":1}}}]}]]}]