Indoor Air Quality — New Fitout

Paints, adhesives, sealants, carpet, vinyl flooring, and composite timber products release a complex mixture of VOCs during and after installation. Total VOC (TVOC) concentrations in newly fitted spaces can exceed 3,000 µg/m³ in the first week, declining over subsequent weeks. Pre-occupancy testing verifies that TVOC levels have reduced to below 500 µg/m³ (Green Star threshold) or 300 µg/m³ (WELL Building Standard threshold).

Formaldehyde is released from urea-formaldehyde resins in MDF, particleboard, plywood, and laminate surfaces. The WES is 1 ppm TWA (1.2 mg/m³) but indoor air quality guidelines are far lower — Green Star requires below 0.1 mg/m³ and WELL requires below 0.027 ppm (33 µg/m³). Active sampling with DNPH cartridge and HPLC analysis provides definitive results.

Construction dust residue, HVAC system contamination from construction works, and incomplete cleaning after fitout contribute to elevated particulate levels in newly fitted spaces. PM2.5 concentrations above 25 µg/m³ indicate inadequate post-construction cleaning or HVAC filter replacement.

Elevated CO₂ concentrations above 800 ppm indicate inadequate fresh air supply from the mechanical ventilation system. CO₂ monitoring during occupancy verifies that the HVAC system delivers the required outdoor air ventilation rate per AS 1668.2.

Typical Worker Groups

Common similar exposure groups (SEGs) assessed for this sub-category.

Regulatory Context

There is no mandatory WHS requirement for pre-occupancy IAQ testing of commercial fitouts in Australia. However, Green Star (GBCA) and WELL Building Standard (IWBI) both include IAQ testing as credit requirements for certification. AS 1668.2 specifies minimum ventilation rates for indoor air quality. Many premium and A-grade commercial landlords require IAQ testing as a condition of fitout approval. The National Construction Code references AS 1668 for mechanical ventilation requirements.