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Publication Date: March 18, 2026
Indoor air can cause just as many problems as outdoor air, sometimes more. When the air inside a building is unhealthy, people feel it in their bodies, moods, and work. For owners, facility managers, and property managers, indoor air quality is closely tied to health, comfort, productivity, and even legal risk.
Poor indoor air quality (IAQ) can lead to more complaints, more sick days, and more stress for everyone involved. It can also point to hidden issues inside the building, like moisture in walls, failing equipment, or unsafe materials. In a place like Los Angeles, which has outdoor pollution, wildfire smoke, heavy traffic, and many older buildings, indoor air quality testing is often the only way to clearly see what people are breathing every day.
The air in a building may look clear, but it can carry a mix of particles, gases, and biological contaminants. These are not always obvious, and people might blame stress, long hours, or allergies when the real problem is indoor air quality.
Poor indoor air quality can affect:
When complaints start to connect with time spent inside the building, it is a warning sign. Testing the air can help reveal what is behind those problems rather than guessing.
Many buildings with air quality issues show the same kinds of health complaints. They seem minor at first, but patterns tell a bigger story. Common warning signs include:
Pay close attention to how and when symptoms show up. Red flags include:
Some groups are more sensitive to poor air quality, such as children, older adults, and people with asthma, allergies, or weakened immune systems. When they start reporting discomfort or breathing trouble in your building, that is often the earliest sign that indoor air quality testing in Los Angeles should be considered.
Indoor air problems do not always stay hidden. Many times, the building itself is trying to get your attention. You may notice:
Musty odors are a clear sign that something is damp. Even if you cannot see mold, the smell often indicates moisture in walls, under flooring, behind cabinets, or inside HVAC components. Water-damaged building materials can feed mold growth and affect air quality long before visible growth appears.
Other subtle clues include:
These signs suggest ongoing moisture, dust, or airflow problems. Indoor air quality testing can help confirm what is in the air and where it might come from.
Your HVAC system is the lungs of the building. When it is not working properly, your air will show it. Pay attention if you notice:
Filters that are not changed regularly allow dust and other particles to be recirculated. Dirty ducts can harbor dust, moisture, or biological growth that is then pushed into occupied spaces. Outdoor air intakes placed near loading docks, busy roads, or parking garages can pull in exhaust and other contaminants.
Professional indoor air quality testing in Los Angeles can measure particle levels, carbon dioxide buildup, and pollutants that may be entering through the HVAC system. This helps identify whether the problem is a lack of fresh air, poor filtration, or contamination from inside or outside the building.
Some events should automatically raise the question: what is in our air now? When a building has undergone a stress event, air quality is likely affected. Common triggers include:
Changes inside the building can also introduce new contaminants. New carpeting, furniture, adhesives, finishes, or cleaning products can release volatile organic compounds (VOCs). When occupant density increases, such as when a space is reconfigured or fully leased, the same HVAC system now needs to serve more people.
Delaying an air quality investigation after a known incident or repeated complaints can increase health risks and property damage and raise regulatory or legal questions later. Acting early helps keep small problems from turning into large and costly ones.
A thorough indoor air quality assessment examines how the building functions as a whole. An environmental consulting and engineering firm typically starts with:
Common indoor air parameters that may be evaluated include mold spores, bacteria, particulates, VOCs, carbon monoxide, carbon dioxide, formaldehyde, and common allergens. Moisture readings, temperature, and relative humidity are often checked as well, since they play a large role in air quality.
Working with indoor air quality professionals who understand local codes and local climate patterns can help you get clear, practical recommendations. The goal is not just to collect data, but to explain what it means and outline reasonable steps to improve conditions and protect people in the long term.
J.S. Held thanks Derrick A. Denis and Paul Anderson for providing insight and expertise that greatly assisted this research.
Derrick Denis joined J.S. Held in May of 2026 as part of J.S. Held's acquisition of Clark Seif Clark, Inc. Derrick is a recognized industry leader, inventor, educator, and author. Since the early 1990’s, he has provided professional industrial hygiene (IH), environmental health and safety (EHS), infection control (IC), and indoor environmental quality (IEQ) services domestically and abroad. As a sought-after presenter, he has delivered hundreds of educational sessions for associations and private groups around the world.
Derrick leverages a B.S. in Environmental Science, multiple certifications and licenses, and extensive experience to serve as a respected, impartial expert witness. He has supported more than 100 state and federal cases on behalf of both plaintiffs and defendants, from depositions through trial testimony. Actively engaged in the industry, Derrick has held board positions with organizations including the Indoor Air Quality Association (IAQA), Environmental Information Association–Arizona Chapter (EIA‑AZ), and the American Council for Accredited Certifications (ACAC). He is also an inventor and patent holder, including a disposable N95 fit test hood for healthcare use and Sewer Gas Solutions®, a patented product designed to prevent sewer gas and pest infiltration through plumbing traps.
Derrick can be reached at [email protected] or +1 480 717 6789.
Paul Anderson joined J.S. Held in May of 2026 as part of J.S. Held's acquisition of Clark Seif Clark, Inc. Paul has over 30 years of experience in the analytical and environmental consulting fields. He leads and executes a wide range of environmental projects, including indoor air quality investigations, microbial and moisture assessments, sick building syndrome investigations, post‑remediation verification, asbestos and lead‑based paint surveys, water intrusion evaluations, wildfire smoke assessments, radon testing, and hazardous materials investigations.
Prior to joining J.S. Held, Paul began his industry career at BAE Systems in Irvine, California, where he supported research and development and product surety testing for the Joint Chemical Agent Detector (JCAD) and Toxic Industrial Chemical Detection (TICS) programs.
Paul can be reached at [email protected] or +1 480 717 6720.
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