Testing Your Office for Carbon Dioxide and Chemicals
Understanding the Factors of office indoor air quality
Why does office indoor air quality matter so much? Because the air your team breathes is shaped by a hidden mix of the building envelope, HVAC performance, and everyday people and activities. You need to pay attention before small issues turn into bigger health and comfort problems. At Indoor Environmental Technologies, we know IAQ is rarely about one single pollutant – it is usually the result of several factors working together.
Pollutant sources in an office can be surprisingly diverse. You have “off-gassing” from synthetic building materials and office furniture (like desks made of particleboard), emissions from high-speed printers and copiers, and even the cleaning chemicals used by the night crew. Then, there is the occupant density. Humans are actually a significant source of indoor pollution—we breathe out carbon dioxide ($CO_2$) and shed bio-effluents. If the building isn’t bringing in enough fresh air to dilute these, the air becomes “stuffy” and heavy.
One of the most critical distinctions we make in Building Science is the difference between intentional ventilation and uncontrolled infiltration.
| Feature | Ventilation | Infiltration |
|---|---|---|
| Source | Mechanical HVAC system / Windows | Cracks, gaps, and leaky seals |
| Control | Highly controlled and filtered | Uncontrolled and unfiltered |
| Air Quality | Usually better (if maintained) | Can pull in humidity and pollutants |
| Impact | Improves IAQ by diluting air | Often causes moisture and mold issues |
Common Pollutants and Health Effects in the Workplace
If you’ve ever felt a “3:00 PM slump” that involves a headache or itchy eyes, you might be experiencing the effects of poor air. This is often referred to as Sick Building Syndrome (SBS). Unlike a specific “Building-Related Illness” (like Legionnaires’ disease), SBS symptoms are broad and usually improve shortly after you leave the building.
Scientific research on health effects shows that poor indoor environmental quality is a major risk factor for productivity complaints. Common culprits include:
- Volatile Organic Compounds (VOCs): These are chemicals that turn into gas at room temperature. They come from paints, carpets, adhesives, and even those “fresh scent” plug-ins.
- Carbon Dioxide (CO2): While not a “poison” at typical office levels, high CO2 is a proxy for poor ventilation. When levels climb, cognitive function drops. You feel sleepy, and your decision-making slows down.
- Formaldehyde: Often found in the glues of office furniture and pressed wood products, this is a known respiratory irritant.
- Particulates: Dust, pollen, and toner particles can trigger asthma episodes—a serious concern for the 15 million Americans who suffer from the condition.
If you are noticing a pattern of symptoms among your coworkers, it may be time to look into IAQ Testing to identify the specific chemical or biological triggers in your environment.
The Role of HVAC Systems and Ventilation Standards
The HVAC system is the lungs of the office. If it isn’t designed, operated, and maintained correctly, the office indoor air quality will suffer. In North America, we look to standards like ASHRAE Standard 62.1 to define what “acceptable” ventilation looks like. This standard calculates how much outdoor air is needed based on the number of people and the square footage of the space.
Another key benchmark is the CSA Standard Z412, which provides guidelines for office ergonomics and thermal comfort. For most offices, a comfortable temperature range is 68–78°F, with air velocity kept low enough to avoid “drafts” but high enough to prevent “stuffiness.”
Modern filtration is also a game-changer. We generally recommend MERV 13 filters where the system can handle them. These filters are efficient enough to capture the tiny particles that carry viruses and bacteria, significantly reducing the risk of airborne infectious disease transmission.
Managing Moisture and Mold in office indoor air quality
In our humid Gulf Coast climate, moisture is the enemy. High humidity (above 60%) is an open invitation for mold growth. We aim to keep office humidity between 30% and 50%. When humidity spikes, it doesn’t just feel sticky—it creates a breeding ground for biological contaminants.
Scientific research on humidity and symptoms confirms that when humidity is out of whack, occupants report more respiratory issues. This is why we emphasize the “24-hour rule”: any water spill or leak must be dried completely within 24 to 48 hours. If a roof leak or a pipe burst isn’t handled immediately, mold will begin to colonize building materials like drywall and ceiling tiles.
If you suspect a hidden leak or see visible staining, a Commercial Mold Inspection is the best way to determine if mold is impacting your air. Mold spores are often invisible to the naked eye, but their impact on your health is very real.
Strategies to Improve and Maintain Workplace Health
Maintaining a healthy workplace isn’t just the job of the “building guy.” It requires a multi-pronged approach: source control (getting rid of the bad stuff), ventilation (diluting what’s left), and air cleaning (filtering out the particles).
Shared Responsibilities for Workers and Managers
Good IAQ is a shared responsibility. The EPA Guide for Occupants suggests several ways everyone can help:
What Workers Can Do:
- Don’t block the vents: It’s tempting to move a filing cabinet in front of a drafty vent, but this unbalances the entire HVAC system, potentially starving your neighbor of fresh air.
- Clean up spills: Report water leaks or spills immediately to prevent mold.
- Manage “smelly” items: Be mindful of strong perfumes, heavy lunches, or personal heaters that might off-gas.
- Follow the no-smoking policy: Tobacco smoke is a major source of indoor pollution.
What Managers Can Do:
- Procure Low-VOC products: When buying new furniture or cleaning supplies, look for “Green” or low-emission certifications.
- Schedule high-pollution tasks wisely: If the floors need waxing or the office is being painted, do it over the weekend when the building is empty.
- Listen to complaints: Establish a clear protocol for reporting air quality concerns.
Handling Renovations and Poor Outdoor Air Events
Renovations are a notorious source of IAQ problems. Dust from sanding drywall, fumes from new carpet glue, and odors from sealants can easily spread through the ductwork to other parts of the building. We recommend using isolation barriers (plastic sheeting) and maintaining “negative pressure” in the construction zone so that dust doesn’t escape into occupied areas.
Outdoor events, like the wildfire smoke we occasionally see drifting into Florida or heavy smog days, also require action. During these times, building managers should:
- Close outdoor air intakes temporarily if outdoor air is severely contaminated.
- Upgrade to MERV 13 or higher filtration.
- Use portable HEPA vacuums for cleaning to ensure fine dust isn’t recirculated.
Standards like ASHRAE Standard 241 provide excellent guidance on managing air during these high-risk periods to ensure “equivalent clean air” is still being delivered to workers.
Professional Steps for Resolving office indoor air quality Issues
If you suspect a problem, don’t wait for people to start calling in sick. Start by looking for patterns. Do people only feel sick in one wing of the building? Do symptoms start on Monday morning and fade by Friday night?
For serious concerns, you can request NIOSH contact info or Indoor Environmental Technologies for a Health Hazard Evaluation. Additionally, OSHA regulations require employers to provide a workplace “free from recognized hazards,” which includes extreme air contaminants.
We provide independent, science-based IAQ testing to help uncover what is affecting your workplace air. Because we do not carry out the remediation work, our findings stay objective. The goal is simple: identify what is in the air, whether that is CO2, VOCs, mold, or other concerns, and give your facility team a clear path to address it.
Whether you manage a busy downtown office or a smaller workplace, better indoor air quality means a healthier, more productive team. If you want to improve workplace air health, start with the basics: ventilation, moisture control, and targeted testing for carbon dioxide and chemicals. Need clear answers about your office air? Contact Indoor Environmental Technologies to take the next step toward a healthier workspace.
