When a Heat Stress at Work Warning is in effect, outdoor and non-air-conditioned indoor tasks should be planned around the warning level, physical workload, work environment and heat-prevention controls already in place.
Practical site actions:
• Exposed outdoor work or high-exertion tasks: apply the appropriate work/rest arrangement for the warning level and workload.
• Effective shade, improved airflow/cooling or reduced physical demand: adjust rest arrangements through risk assessment.
• Uncontrolled heat sources, poor ventilation, impermeable PPE, or workers who are not yet acclimatised: strengthen controls and provide additional rest.
• Under a Black warning, re-plan high-exertion tasks first. In the official baseline schedule, heavy and very heavy outdoor work, as well as very heavy non-air-conditioned indoor work, are suspended.
Warnings update hourly—and can update earlier when the level rises. Each update should trigger a review, crew briefing and execution record.
Protecting workers means turning every warning update into a clear site action.
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【炎夏施工，按工作暑熱警告做好安排，保護工友。】
炎夏施工，保護工友不只是多放幾支水或臨時叫大家休息。
當工作暑熱警告生效，戶外及沒有空調的室內工序，應按警告級別、工作勞動量、工位環境，以及已採取的防暑措施，預先調整工作／休息安排。
現場可以這樣做：
• 露天、直曬或高勞動量工序：按該時段的警告級別與官方基準安排工作／休息。
• 有效遮蔭、加強氣流／散熱，或採用機械輔助降低勞動量：可按風險評估調整所需休息時間。
• 熱源未妥善隔離或抽走熱氣、通風不足、不透氣 PPE、未完成／需要重新熱適應的工友：需要加強安排，並增加休息時間。
• 黑色警告下，應優先重排高勞動量工序；在官方基準安排中，戶外重／極重勞動，以及沒有空調室內的極重勞動，須暫停工作。
警告每小時更新；如級別上升，亦可能提早更新。每次更新後，現場都應覆核安排、清楚通知工友，並留下執行紀錄。
有空調的室內工作不適用上述按警告而設的每小時安排；但如工位接近熱源，仍須按實際風險作評估。
保護工友，不是等到有人不適才反應；而是讓每一次警告更新，都變成現場清晰、可執行的行動。
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