Sydney’s CBD and city-fringe markets are dominated by high-rise office towers, premium assets and long-lease corporate tenancies. These buildings are competing on tenant experience, ESG performance and health credentials – and increasingly, indoor air quality (IAQ) is part of that story.

Yet in Australia there are still very few specific controls on IAQ, beyond general workplace health and safety obligations. DCCEEW That means the quality of the air in many Sydney offices is largely invisible – and rarely measured – unless an organisation chooses to make it a priority.

At the same time:

• IAQ is being recognised as a critical accessibility and inclusion issue for people with chronic health conditions. The Safer Air Project
   
• Evidence continues to link cleaner indoor air with higher productivity, better cognitive performance and reduced absenteeism. Harvard Chan School of Public Health
   
• Investors are using ESG benchmarks such as GRESB and certification systems such as WELL to assess how buildings are managed in practice – including their indoor environment.documents.gresb.com
   

For Sydney building owners, managers and corporate tenants, IAQ testing is becoming part of doing business, not an optional extra.

Why indoor air quality is now a boardroom issue in Sydney’s CBD

Sydney’s office market has a few features that make IAQ particularly important:

• High occupant density: open-plan floors, hot-desking and long hours on-site
   
• Heavy reliance on mechanical ventilation: sealed façades, limited operable windows
   
• Complex tenancy arrangements: multiple tenants across stacked floors with shared building systems
   
• ESG-conscious investors and tenants: global funds, listed REITs, government and blue-chip occupiers

We also know that indoor air can have higher concentrations of some pollutants and different health risks than outdoor air, depending on sources and ventilation.

Combine that with the ongoing reality of airborne infections such as COVID-19 and influenza, and Sydney’s office assets are under pressure to show how they’re managing IAQ as part of:

• Work health and safety
   
• Accessibility and inclusion (especially for immunocompromised staff and visitors)
   
• ESG performance and disclosure

IAQ testing turns this from a vague promise into something measurable.

IAQ as an accessibility and inclusion issue for Sydney workplaces

The Safer Air Project frames indoor air as a core accessibility issue, not just a comfort factor: many people with chronic illnesses or other risk factors face disproportionate harm from poor indoor air and airborne infections in shared spaces like offices and transport hubs.

For large Sydney employers, this has direct implications:

• People with chronic conditions are present in every team and every workplace.
   
• Improving IAQ reduces health risks for those employees and visitors, and
   
• At the same time, delivers broader benefits: better cognitive function, higher productivity and lower costs.

When you commission IAQ testing and act on the results, you’re not just optimising a building system – you’re making your Sydney offices more accessible and safer for everyone who uses them.

How IAQ testing supports ESG, WELL and GRESB for Sydney assets

For many Sydney office towers and premium assets, ESG reporting isn’t optional. Global investors are using benchmarks like GRESB as the standard for assessing real estate ESG performance, and alignment with standards like WELL is now explicitly mapped to GRESB indicators.

IAQ testing helps by:

• Providing evidence to support narratives around health, wellbeing and indoor environment quality in investor reports and sustainability disclosures
   
• Generating asset-level data that can be fed into ESG frameworks and certification pathways
   
• Demonstrating that management policies around ventilation, filtration and infection control are translated into measurable performance

While the 2024 GRESB Real Estate Standard focuses heavily on asset-level performance and data quality, health and wellbeing themes increasingly sit alongside energy, emissions and water in the way investors evaluate “high-performing” assets.

For Sydney portfolios, that means IAQ testing is both a risk management tool and a way to strengthen your ESG story.

What indoor air quality testing looks like in a Sydney office tower

QED designs IAQ assessments around the way Sydney buildings actually operate – often with:

• large floorplates
   
• mixed-tenancy stacks
   
• extended hours
   
• highly optimised HVAC for energy and comfort.

A typical IAQ testing program for a Sydney CBD or North Sydney office might include:

1. Desktop review and stakeholder briefing

• Understand the asset: base-building systems, recent upgrades, complaints history, tenant profile
   
• Map out high-priority areas: densely occupied floors, call centres, trading floors, large meeting rooms, end-of-trip facilities
   
• Clarify drivers: WHS, ESG reporting, certification (e.g. WELL), tenant concerns or leasing strategy

2. Site inspection and system review

• Inspect outside air intakes, air handling units and filtration
   
• Review how ventilation is controlled (CO₂-based demand control, time schedules, economy cycles)
   
• Check for obvious issues (blocked diffusers, poorly located returns, water damage, visible mould)

3. Baseline IAQ monitoring

We typically measure key parameters such as:

• Carbon dioxide (CO₂): to indicate how effectively exhaled air is being removed relative to occupancy
   
• Particulate matter (PM₂.₅ and PM₁₀): to capture fine particles from outdoor air, combustion sources and indoor activities
   
• Temperature and relative humidity: for comfort, thermal stress and mould risk
   
• VOCs (volatile organic compounds): from fit-outs, furnishings and cleaning products
   
• Carbon monoxide (CO) and other gases: where car parks or combustion sources are relevant

Measurements can be:

• Spot checks during representative occupancy, and/or
   
• Continuous logging over several days or weeks to capture peaks (e.g. Monday mornings, fully booked meeting days, events).

4. Targeted diagnostic testing

If there are specific concerns – for example:

• complaints of “stuffy” rooms despite apparently adequate ventilation
   
• lingering odours after refurbishments
   
• floors with higher reported illness or discomfort

we can add:

• airflow measurements and pressure mapping
   
• more detailed VOC profiling
   
• moisture and microbial assessments where water or condensation issues are suspected.

5. Interpretation against guidelines and emerging IAQ standards

There is growing momentum in Australia to introduce enforceable indoor air quality performance standards, especially for public and high-occupancy buildings, including clear limits on CO₂ and key pollutants.

QED interprets your results in the context of:

• relevant Australian and international guidelines,
   
• emerging recommendations on IAQ performance and infection risk, and
   
• your risk appetite, asset strategy and tenant profile.

6. Clear, prioritised recommendations

You receive a report that is designed for action. Recommendations are usually grouped as:

• Operational adjustments: setpoint changes, extended outside air hours, meeting room booking rules, occupancy limits
   
• Maintenance and optimisation: filter upgrades, sealing of bypasses, balancing supply and return air, addressing identified defects
   
• Strategic upgrades: enhanced filtration in central plant, local HEPA/UVGI solutions in high-risk or premium areas, continuous IAQ monitoring dashboards.

Key IAQ metrics for Sydney building owners and tenants

For owners and corporate tenants in Sydney, a few IAQ metrics are particularly useful:

• CO₂ levels during peak occupancy:
  • A practical proxy for how much rebreathed air people are exposed to, and a key indicator in many IAQ guidelines and performance proposals. Chief Scientist
     
• PM₂.₅ trends over time:
  • Especially relevant in dense urban areas and during bushfire smoke events.
     
• VOCs after fit-outs:
  • Help manage “new build” or “new fit-out” odours and potential health complaints.
     
• Thermal comfort (temperature and humidity):
  • Affects comfort, perceived air quality and mould risk.

When these metrics are monitored and shared transparently, they provide confidence to tenants and staff that the building is being actively managed for healthier indoor environments.

Practical IAQ improvements in dense CBD and high-rise assets

The right mix of interventions will vary by building, but common strategies in Sydney CBD assets include:

• Optimising outside air rates while managing energy and thermal comfort
   
• Upgrading filters to higher efficiency (e.g. capturing more fine particles) where systems can accommodate it
   
• Adding local air cleaners or upper-room UVGI in high-risk areas such as large meeting rooms or call centres
   
• Implementing demand-controlled ventilation that responds intelligently to CO₂ or occupancy data
   
• Deploying IAQ dashboards in lobbies or tenant apps to “make the invisible visible” and support behaviour change.

Crucially, these changes can be targeted using IAQ test data, so you invest where the health, accessibility and ESG benefits are greatest.

How QED supports indoor air quality testing in Sydney

QED works with building owners, asset managers, facilities teams and corporate tenants across Sydney – including the CBD, North Sydney, Parramatta and city-fringe markets – to:

• Benchmark IAQ performance in single assets and portfolios
   
• Design and deliver IAQ testing programs that align with WHS, ESG and certification objectives
   
• Translate technical results into clear actions for engineering, management and tenant communications
   
• Support ESG reporting and disclosure, including alignment with frameworks such as GRESB and WELL.

Whether you manage a premium-grade tower, a mixed-use asset or a campus-style office in greater Sydney, we can tailor an IAQ assessment to your building, budget and timeframes.

Ready to make indoor air part of your building’s competitive edge?

If you’d like to:

• understand the air your people are breathing in your Sydney offices
   
• respond to tenant or staff concerns about ventilation and infection risk
   
• strengthen your ESG and accessibility story with real IAQ data

Talk to QED about indoor air quality testing in Sydney and how we can help you turn invisible air into a visible asset for your people, your tenants and your investors.