INVISIBLE HAZARDS: THE RISKS YOU CAN'T SEE IN THE AIR
How particle counting, airflow checks, and indoor air quality (IAQ) monitoring helps teams manage the invisible hazards summer makes harder to ignore.
PARTICLES SMALL ENOUGH TO REACH DEEP LUNG TISSUE
RECOMMENDED RATING FOR SMOKE & FINE PARTICULATES
PARTICLE SIZE CHANNELS MEASURED BY VPC260
When people think about workplace hazards, they often picture exposed wiring, slippery floors, or heavy machinery. But some of the most significant risks in commercial buildings, schools, healthcare facilities, manufacturing plants, and warehouses are completely invisible.
Every day, building occupants breathe thousands of gallons of air without knowing what particles may be circulating around them. Dust, pollen, mold spores, smoke particles, and other airborne contaminants are often impossible to detect without specialized instruments. Yet these invisible hazards can affect health, comfort, productivity, equipment performance, and even business operations.
As organizations place greater emphasis on workplace safety and indoor environmental quality, understanding what is in the air has become more important than ever.
The Air Around Us Is Constantly Changing
Indoor air quality is not static. It changes throughout the day based on occupancy, weather conditions, HVAC performance, outdoor pollution levels, and activities occurring within the building.
During the summer months, these challenges often become even more pronounced. Wildfire smoke can travel hundreds of miles and infiltrate buildings far from the source. Construction projects generate airborne dust. Elevated pollen counts can impact schools and office buildings. Increased cooling demands place additional stress on HVAC systems and filtration equipment.
The challenge is that many of these contaminants exist at a scale too small for the human eye to detect.
Particles are often measured in microns, a unit so small that dozens could fit across the width of a human hair. Some of the most concerning particles, including PM2.5, are small enough to travel deep into the lungs and remain suspended in the air for extended periods.
The Cost of Ignoring Air Quality
Poor indoor air quality can impact far more than occupant comfort.
Elevated airborne particle levels have been associated with respiratory discomfort, headaches, eye discomfort, fatigue, and reduced concentration. For individuals with asthma, allergies, or other respiratory conditions, exposure to airborne contaminants can be especially problematic.
The impact can extend beyond people as well.
In manufacturing environments, excessive airborne particles can contaminate products, affect quality control processes, and increase maintenance requirements. In healthcare facilities, air cleanliness plays a critical role in protecting patients and staff. In data centers and critical infrastructure facilities, dust accumulation can impact cooling performance and contribute to equipment reliability issues.
Poor air quality can also place additional strain on HVAC systems. As filters become overloaded with particulate matter, airflow can decrease, and system efficiency can suffer. Left unchecked, these issues can increase energy costs, shorten equipment life, and create a cycle of declining indoor air quality.
Because these hazards are often invisible, they can go unnoticed for weeks or months before the consequences become apparent.
The Role of HVAC Filtration
For most facilities, the HVAC system serves as the first line of defense against airborne contaminants.
Air filters are designed to capture particles before they circulate throughout a building. The effectiveness of those filters is commonly measured using the Minimum Efficiency Reporting Value (MERV) rating system.
Developed by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), MERV ratings provide a standardized way to evaluate how effectively air filters capture particles of different sizes.
Higher MERV ratings generally indicate a greater ability to capture smaller particles.
However, MERV ratings only tell part of the story. A filter may have an excellent rating on paper, but performance can be affected by airflow, installation quality, system maintenance, and the condition of the filter itself. Even the best filtration system can become less effective if filters are clogged, damaged, or overdue for replacement.
This is why many facility managers are moving beyond scheduled filter replacement and toward data-driven air quality monitoring.
Detecting Hazards Your Eyes Can't See
At Flir, detecting hazards that you can't see has long been at the heart of helping professionals make better decisions. While thermal cameras reveal hidden heat patterns, air quality instruments help uncover another invisible threat: airborne contamination.
The first step toward improving air quality is understanding what is present in the air. This is where air particle counters play an important role.
Air particle counters use laser-based technology to measure airborne particles as they pass through a sampling chamber. As particles cross a laser beam, the instrument detects and counts them, providing real-time information about particle concentration and size.
Rather than relying on assumptions, facility managers can use particle counters to gain objective insight into indoor air quality conditions.
Extech Instruments
VPC260 6-Channel Particle Counter
Measures up to six particle size channels alongside temperature, humidity, dew point, and wet bulb temperature. Identifies smoke, exhaust, respirable crystalline silica dust (RCS), airborne combustible dust, and other pollutants that may impact occupant health or facility operations.
Looking Beyond Particles
While airborne particles are an important indicator of indoor air quality, they are only one piece of the puzzle. Ventilation effectiveness, airflow, temperature, humidity, and gas concentrations all influence the health, comfort, and productivity of building occupants.
Proper airflow is essential for maintaining healthy indoor environments. Even the most effective filtration system cannot perform as intended if conditioned air is not reaching occupied spaces or if ventilation systems are not properly balanced.
To evaluate ventilation performance, HVAC professionals often rely on instruments such as the Extech AN300 Large Vane CFM/CMM Thermo-Anemometer. By measuring air velocity, airflow, and temperature, technicians can verify that ventilation systems are delivering the appropriate volume of air throughout a facility. These measurements can help identify airflow restrictions, poorly balanced systems, or areas receiving insufficient ventilation.
Extech Instruments
AN300 Large Vane CFM/CMM Thermo-Anemometer
Measures air velocity, airflow, and temperature to verify ventilation systems are delivering the appropriate volume of air throughout a facility. Helps identify airflow restrictions, poorly balanced systems, or areas receiving insufficient ventilation.
In addition to particulate matter and airflow, gases such as carbon dioxide and carbon monoxide can provide valuable insight into indoor environmental conditions.
Elevated carbon dioxide levels are often associated with inadequate ventilation, while carbon monoxide can present a serious health concern when combustion equipment is not operating properly.
Extech Instruments
CO260 CO/CO₂ Meter + Psychrometer
Monitors both CO and CO₂ gases while also tracking temperature, humidity, dew point, and wet bulb temperature. Built-in datalogging capabilities allow users to identify trends, document changing conditions, and evaluate how occupancy and ventilation patterns affect indoor air quality over time.
For organizations that require continuous visibility into multiple air quality indicators, the Extech IAQ320 Indoor Air Quality Monitor and Datalogger provides a broader picture of building conditions.
Extech Instruments
IAQ320 Indoor Air Quality Monitor & Datalogger
Continuously measures particulate matter, carbon dioxide, air temperature, relative humidity, and an Indoor Air Quality Health Index. Designed for applications ranging from schools and hospitals to manufacturing facilities and cleanrooms.
Together, these tools provide a more complete understanding of the indoor environment. Particle counters help identify airborne contaminants. Airflow meters verify ventilation performance. Gas monitors provide insight into potential ventilation and safety concerns. Continuous indoor air quality monitors help identify trends and changing conditions over time.
When combined with effective HVAC filtration strategies and appropriately selected MERV-rated filters, these measurements allow organizations to move beyond assumptions and make more informed decisions about indoor air quality.
A Smarter Approach to Summer Safety
Many workplace hazards can be identified through visual inspections. Airborne particles are different. They often remain hidden until they begin affecting people, equipment, or operations.
By combining effective filtration strategies with air quality monitoring tools, organizations can better understand their environments and respond to changing conditions before they become larger problems.
Whether the source is wildfire smoke, seasonal allergens, dust, construction activities, or aging HVAC systems, one thing remains true: you cannot manage what you cannot measure.
As part of a proactive safety strategy, Flir and Extech air quality instruments help facility managers better understand the environments they are responsible for protecting. By turning invisible airborne threats into measurable data, organizations can make more informed decisions about filtration, ventilation, maintenance, and occupant safety.
Flir & Extech instruments
—Turning invisible threats into measurable data.
