What Happens to Air During the Day

Office air is not static. It changes continuously throughout the day. As people work, meet, and move within a space, the indoor environment gradually accumulates:

– carbon dioxide (CO₂) from human presence

– fine particulate matter (PM2.5)

– volatile organic compounds (VOCs) from furniture, equipment, and materials

– outdoor pollution that enters and remains indoors

These pollutants are not always noticeable. There is often no smell, no visible signal, no immediate discomfort. But their impact is real.

How Air Affects the Way We Work

Indoor air quality has a direct effect on cognitive performance. In environments with lower air quality, studies consistently observe:

– reduced concentration

– slower information processing

– impaired decision-making

– lower performance on complex tasks

These changes are gradual. That is precisely why they are rarely recognized as a problem. People tend to describe the experience as “fatigue” or “a long day,” rather than identifying the underlying cause.

The Data Behind the Experience

The COGfx study by Harvard T.H. Chan School of Public Health measured cognitive performance under different indoor air conditions. The results are difficult to ignore.

Participants exposed to improved air quality achieved up to 61% higher cognitive scores, along with significant gains in focus and decision-making ability. Under otherwise identical conditions. Air quality alone made the difference.

Why Ventilation Is Not Enough

A common assumption in office environments is that if ventilation is working, air quality is under control. This assumption is incomplete. Ventilation is designed primarily to manage CO₂ levels by introducing fresh air and maintaining circulation. But ventilation does not remove all pollutants. Fine particles (PM2.5), gases such as VOCs, and biological contaminants require specialized filtration. In other words:

Ventilation moves air.

It does not clean it.

Measurement and Sustainability

Sustainability begins with measurement. What cannot be measured cannot be managed.

In the context of indoor environments, this means air quality must be:

– monitored

– analyzed

– actively managed

Without data, air quality is assumed – not controlled.

Air as Part of the Workplace Infrastructure

The office is not just a space. It is the environment in which people think, collaborate, and make decisions. When air quality is optimized, work becomes easier, faster, and more effective. When it is not, the impact is still there – just less visible. Forward-thinking organizations are beginning to treat air not as comfort, but as part of their operational infrastructure.