Product Overview

Summary: This Indoor Air Quality Assessment SOP sets out a clear, repeatable method for evaluating and managing air quality in Australian workplaces. It helps organisations identify airborne contaminants, comfort issues and ventilation deficiencies before they become health, productivity or compliance problems.

Indoor air quality (IAQ) has a direct impact on worker health, comfort and productivity, particularly in modern, sealed buildings that rely heavily on mechanical ventilation. Poor IAQ is associated with headaches, fatigue, respiratory irritation, increased absenteeism and can exacerbate asthma and other chronic conditions. This Indoor Air Quality Assessment Safe Operating Procedure provides a structured, evidence-based approach to assessing and managing IAQ across offices, warehouses, healthcare facilities, education settings and other Australian workplaces.

The SOP guides you through planning and conducting IAQ assessments, including defining assessment objectives, selecting appropriate measurement parameters, undertaking site inspections and collecting data using calibrated instruments and recognised methods. It also covers the interpretation of results against relevant Australian guidelines and standards, identification of root causes (such as inadequate ventilation, moisture ingress or contaminant sources), and the development of practical corrective actions. By implementing this SOP, businesses can demonstrate due diligence under WHS legislation, respond effectively to worker concerns about air quality, and embed IAQ monitoring into their ongoing safety and facility management programs.

Designed for real-world use, the procedure supports both in-house assessments and work undertaken by external consultants. It standardises documentation, reporting and communication with workers, enabling organisations to track IAQ trends over time, prioritise remediation works and verify the effectiveness of control measures such as HVAC adjustments, filtration upgrades and cleaning practices.

Key Benefits

• Ensure a consistent, defensible method for assessing indoor air quality across all sites.
• Reduce health risks associated with poor IAQ, including respiratory irritation, headaches and exacerbation of asthma.
• Demonstrate compliance with WHS duties by proactively identifying and controlling airborne hazards in the workplace.
• Streamline communication with workers by providing clear processes for responding to IAQ complaints and concerns.
• Support data-driven decisions on HVAC maintenance, filtration upgrades and building remediation works.

Who is this for?

• WHS Managers
• Health and Safety Advisors
• Facilities Managers
• Property and Asset Managers
• Operations Managers
• Environmental Health Officers
• Building Services Engineers
• Maintenance Supervisors
• Risk and Compliance Managers
• HR and People & Culture Managers

Hazards Addressed

• Exposure to airborne contaminants such as dusts, fumes, vapours and biological agents (mould, bacteria, allergens).
• Inadequate ventilation leading to elevated carbon dioxide (CO₂) levels and occupant discomfort or fatigue.
• Moisture and dampness contributing to mould growth and associated respiratory health risks.
• Off-gassing from building materials, furnishings, cleaning agents and office equipment (volatile organic compounds – VOCs).
• Thermal discomfort due to poorly controlled temperature and humidity, impacting wellbeing and productivity.
• Cross-contamination of air between different areas (e.g. from workshops, car parks, laboratories or amenities into offices).

Included Sections

• 1.0 Purpose and Scope
• 2.0 Definitions and Key Concepts (IAQ, contaminants, comfort parameters)
• 3.0 Roles and Responsibilities
• 4.0 Legislative and Standards Framework
• 5.0 Pre-Assessment Planning and Trigger Criteria
• 6.0 Indoor Air Quality Risk Factors and Building Profile
• 7.0 Required Equipment, Instruments and Calibration Requirements
• 8.0 Step-by-Step Indoor Air Quality Assessment Procedure
• 9.0 Sampling Strategy and Measurement Parameters (CO₂, CO, particulates, VOCs, temperature, humidity etc.)
• 10.0 Visual Inspection Checklist (HVAC, moisture, cleanliness, contaminant sources)
• 11.0 Data Recording, Interpretation and Comparison with Guidelines
• 12.0 Identification of Root Causes and Risk Evaluation
• 13.0 Corrective and Preventive Actions (engineering, administrative and housekeeping controls)
• 14.0 Communication and Consultation with Workers and HSRs
• 15.0 IAQ Complaint Handling and Escalation Process
• 16.0 Documentation, Reporting and Recordkeeping Requirements
• 17.0 Integration with Maintenance, HVAC and Contractor Management
• 18.0 Training and Competency Requirements
• 19.0 Review, Reassessment Frequency and Continuous Improvement
• 20.0 Appendices – Sample Forms, Checklists and IAQ Assessment Report Template

Legislation & References

• Work Health and Safety Act 2011 (Cth) and harmonised state and territory WHS Acts
• Work Health and Safety Regulations 2011 and equivalent state and territory regulations
• Safe Work Australia – Managing the Work Environment and Facilities: Code of Practice
• Safe Work Australia – How to Manage Work Health and Safety Risks: Code of Practice
• Safe Work Australia – Guidance on the Health Effects of Exposure to Mould in the Workplace (where applicable)
• AS 1668.2: The use of ventilation and airconditioning in buildings – Mechanical ventilation in buildings
• AS 1668.4: The use of ventilation and airconditioning in buildings – Natural ventilation of buildings
• AS 3666.2: Air-handling and water systems of buildings – Microbial control – Operation and maintenance
• AS 1837: Code of practice for application of ergonomics to factory and office work (for thermal comfort and environment)
• National Construction Code (NCC) – Performance requirements for ventilation and indoor environment quality