Industrial Hygiene

Thermal Stress & Illumination Surveys

Heat stress, cold stress, and workplace illumination assessment

Programme overview

Thermal Stress &
Illumination Surveys

Heat, cold, and lighting affect worker safety, productivity, and wellbeing. We deliver WBGT-based heat stress assessment per ACGIH and ISO 7243, cold stress evaluation per ISO 11079, and illumination surveys per IES and BIS standards.

Thermal Stress & Illumination Surveys — Overview
How we deliver it

Our implementation model

A practical, phased delivery approach — from gap assessment through operational embedding — built around your regulatory context.

Heat Stress Risk Assessment

Assess heat stress per ISO 7933 (PHS - Predicted Heat Strain) / NIOSH Heat Stress Criteria / ACGIH TLV; measure WBGT (Wet Bulb Globe Temperature), air temperature, humidity, radiant heat, air velocity; profile metabolic rate per ISO 8996.

Cold Stress Risk Assessment

Assess cold stress per ISO 11079 (IREQ - Insulation REQuired) / ACGIH TLV — wind chill index, exposure time at cold extremities; identify hypothermia / frostbite risk; align with cold-weather PPE per ISO 11079.

Work-Rest Regime Specification

Specify work-rest regime per ACGIH TLV / NIOSH Heat Stress — work-rest ratio per WBGT and metabolic rate; specify hydration schedule (typically 4-8 oz every 15-20 minutes per OSHA Heat Illness Prevention).

Illumination Survey & Design

Conduct illumination survey per IES Lighting Handbook / EN 12464-1 — illuminance (lux) measurement per task, uniformity, glare (UGR — Unified Glare Rating), colour rendering (Ra), flicker; align with task visual demand.

Engineering Controls Design

Specify engineering controls per ISO 7243 / EN 12464 — shading, reflective surfaces, ventilation, cooling (spot cooling, refrigeration), thermal insulation (cold work), lighting upgrade (LED, fixture replacement); align with energy efficiency.

Surveillance & Training Programme

Design medical surveillance — heat illness incidence tracking, pre-placement / periodic medical exam, biological monitoring; deliver training on heat / cold stress recognition, hydration, work-rest discipline; align with OSHA Heat Illness Prevention.

What the programme covers

Thermal Stress &in full scope

WBGT measurement and heat stress evaluation
Work-rest regime determination
Cold stress (WCT) assessment
Illumination level and uniformity survey
Glare and contrast assessment
Emergency lighting validation
Control hierarchy: engineering, administrative, PPE
Thermal Stress & Illumination Surveys — Coverage
Business value

Value of Thermal Stress & Illumination Surveys

Heat Stress & Vision Hazard Prevention
  • Prevents heat exhaustion and cold injury
  • Reduces fatigue-related incidents
  • Improves visual task performance
  • Supports safe emergency egress
OSHA Heat / ISO 7933 Thermal Defence
  • Tracks to ACGIH and ISO standards
  • Documents Factories Act illumination compliance
  • Supports OSHA heat-illness prevention
  • Withstands worker compensation scrutiny
Work-Rest Regime & Lighting Programme
  • Improves productivity and quality
  • Reduces absenteeism
  • Underpins realistic shift planning
  • Optimises HVAC and lighting design
Thermal & Illumination Incident Cost
  • Cuts heat-illness and ergonomic claims
  • Reduces lighting and HVAC energy
  • Supports productivity gains
  • Improves worker retention
Get Started

Ready to start your project?

Speak with our team to scope an engagement tailored to your facility, regulatory context, and lifecycle stage.