Heat Stress Awareness Campaign: Full Playbook

Heat stress kills more workers globally than most people realise, and the risk window keeps getting longer as summers extend. This playbook covers a full heat stress awareness campaign — early warning signs, hierarchy of controls, hydration schedules, and the exact materials a supervisor needs to run it from the first shift.

Why heat stress campaigns matter

• Heat illness escalates in minutes — awareness has to be delivered before the season, not during it.
• Physically demanding jobs and PPE double the effective heat load on workers.
• New starters and returning workers are at highest risk in their first two weeks.
• Symptoms are easy to mistake for fatigue — training people to recognise them saves lives.

Early warning signs to communicate

Teach every worker and supervisor to recognise the progression, not just the worst case:

• Heat rash — the first sign the body's cooling system is overloaded.
• Heat cramps — painful muscle spasms, often in the abdomen or legs.
• Heat exhaustion — heavy sweating, weakness, headache, nausea, and cool clammy skin.
• Heat stroke — hot dry skin, confusion, collapse. This is a medical emergency: cool the person immediately and call for help.

Hierarchy of controls for heat

1. Eliminate — reschedule high-exertion tasks to cooler parts of the day or year.
2. Substitute — mechanise or automate exposure-heavy tasks where possible.
3. Engineering controls — shade, ventilation, cooling stations, and air-conditioned rest areas.
4. Administrative controls — work-rest cycles, acclimatisation programmes, buddy checks.
5. PPE — cooling vests, breathable fabrics, wide-brimmed hats. The last line, not the first.

Hydration guidance to publish

Publish clear, plain-language guidance that workers can act on without needing to look anything up:

• Start the shift hydrated — don't wait to feel thirsty.
• Small, frequent sips beat large intermittent drinks.
• Electrolytes matter when sweating heavily for more than an hour.
• Urine colour is a simple check — pale straw is the target.
• Coffee and energy drinks are not substitutes for water.

Campaign materials to prepare

• Toolbox talk on early warning signs and buddy checks.
• Posters for rest areas showing symptom progression and response.
• Pocket cards with the urine colour chart and hydration prompts.
• Supervisor briefing on acclimatisation for new and returning workers.
• Emergency response one-pager for heat stroke — cooling before transport.

Acclimatisation — the most-missed control

A worker's tolerance to heat builds gradually. New starters, workers returning from leave, and workers new to a hot climate need a graduated exposure plan over their first one to two weeks. Publish the plan, name the supervisor accountable, and treat non-compliance as seriously as any other control failure.

Related resources

• Monthly safety campaign calendar
• 150+ toolbox talk topics
• 5-minute safety talks