Haze Safety Signs Singapore: What You Need to Display During Haze Season (2026 Guide)

Singapore is entering its annual haze risk window. With El Niño and a potential positive Indian Ocean Dipole forecast from June to October 2026, the Meteorological Service Singapore has warned of increased risk of transboundary haze from regional vegetation and peatland fires.

For employers, this isn’t just a health advisory — it’s a legal obligation. Under the Workplace Safety and Health (WSH) Act, employers must conduct risk assessments and implement appropriate measures to minimise haze exposure. Clear signage is a core part of that obligation.

Why Signage Matters During Haze

When PSI levels rise, workers — especially those in outdoor, construction, and logistics roles — need to know immediately:

Where to find respiratory protection (N95 masks)
Which areas require PPE
Where air-conditioned rest areas or refuges are located
That certain outdoor work has been suspended

Clear, compliant safety signs communicate this faster than any briefing. In an emergency, a sign is often the first and only thing a worker sees.

Which Safety Signs Should Be Displayed During a Haze Alert?

1. Mandatory PPE Signs (Blue)

Display at entry points to all outdoor work zones:

“Respiratory Protection Must Be Worn” — Required when PSI exceeds 101 (Unhealthy range)
“Eye Protection Must Be Worn” — For workers exposed to irritants during haze
“Protective Clothing Must Be Worn” — For workers handling materials outdoors

These signs must comply with SS 508 Part 1 (ISO 7010) and use the correct blue mandatory format.

2. Warning Signs (Yellow/Black)

Post at site perimeters and entry checkpoints:

“Caution: Haze Conditions — PPE Required Beyond This Point”
“Warning: Outdoor Work Restricted — PSI Above 100”

3. Emergency / Refuge Area Signs (Green)

Workers need to know where to shelter:

“Rest Area” / “Air-Conditioned Rest Point” — Direct workers to indoor refuge
“First Aid” — Ensure first aid stations are clearly marked; haze can trigger respiratory emergencies

4. Prohibition Signs (Red Circle)

Where outdoor activity is suspended:

“No Entry — Outdoor Work Suspended” — For sectors, zones, or scaffolding areas temporarily closed during PSI 300+ conditions

MOM’s Requirements for Haze Signage

Under the WSH (Workplace Safety and Health) Act, signage must be:

Legible and prominently placed at the point of hazard or entry
SS 508 and ISO 7010 compliant — using the correct colour coding, shapes, and pictograms
Durable — for outdoor use, aluminium or UV-resistant PVC is recommended over paper or vinyl alone

The MOM haze guidelines state employers must “establish a system to regularly update employees on haze conditions and measures being implemented.” Physical signage is the most reliable part of that system — it works even when workers are not checking their phones.

PSI-Level Signage Action Guide

PSI Level	WHO Classification	Minimum Signage Action
0–50	Good	No additional signage required
51–100	Moderate	Place N95 availability notices at PPE stations
101–200	Unhealthy	Mandatory PPE signs at all outdoor zones
201–300	Very Unhealthy	Add warning signs at perimeters; post rest area signage
300+	Hazardous	Post “Outdoor Work Suspended” prohibition signs throughout site

What to Look for When Buying Haze Safety Signs

Material: Aluminium (1.2mm) or UV-resistant rigid PVC for outdoor durability in wet, smoky conditions
Compliance: Must meet SS 508 (Singapore Standard) and reference ISO 7010 pictograms
Photoluminescent option: For low-visibility haze conditions, glow-in-the-dark signs ensure 24-hour legibility
Custom text: If your site needs bilingual English/Mandarin or English/Tamil signs for your workforce, custom printing ensures clarity for all workers

Prepare Before the Haze Arrives

Procurement takes time. Order haze-related safety signs before PSI levels spike — not during, when every construction site in Singapore is placing orders simultaneously.

Shop haze safety signs at safetysigns.sg — SS 508 compliant, fast Singapore delivery.