About VOC’s and Air Quality

Volatile Organic Compounds (VOCs) are a group of chemicals that can be found in various everyday products and environments, and they have a significant impact on respiratory health. VOCs are emitted as gases from certain solids or liquids, and they can linger in the air we breathe. Common sources of VOCs include household cleaning products, paints, solvents, air fresheners, and even new furniture.

When we inhale air containing VOCs, they can enter our respiratory system and potentially cause health issues. Some VOCs can irritate the eyes, nose, and throat, leading to short-term discomfort. Prolonged exposure to high levels of VOCs has been linked to more serious respiratory problems, including worsening of asthma symptoms and an increased risk of respiratory infections. In addition, some VOCs can contribute to the formation of outdoor air pollution, like smog, which can further impact respiratory health.

To protect your respiratory well-being, it’s essential to be mindful of the products you use and the environments you spend time in. Opt for low-VOC or VOC-free products whenever possible, ensure good ventilation in indoor spaces to reduce VOC concentrations, and limit exposure to strong-smelling chemicals. Being aware of VOCs and making informed choices can contribute to better air quality and healthier lungs.

Damp areas and crawlspaces in homes can sometimes produce unpleasant odors that indicate the presence of various compounds and microorganisms. These odors are often a sign of underlying issues that cann impact both indoor air quality and respiratory health.

One common odor is the musty or earthy smell associated with mold and mildew growth. When excess moisture accumulates in dark and poorly ventilated spaces, it creates an ideal environment for mold and mildew to thrive. These fungi release volatile organic compounds (VOCs) as they grow, leading to the distinctive musty odor. Inhaling mold spores and their byproducts can trigger allergies, worsen asthma symptoms, and even cause respiratory infections in some cases.

Another odor that can arise from damp areas is a sewage or rotten egg smell. This scent could indicate the presence of hydrogen sulfide gas, a byproduct of decaying organic matter. It might also suggest a malfunction in the plumbing system, such as a broken sewer pipe or a blocked drain.

A damp, foul odor could also come from the presence of rodents or pests in crawlspaces. The urine, feces, and bodies of these animals can emit strong, unpleasant odors. Inhaling particles from rodent waste can lead to respiratory irritation and potentially transmit diseases.

To address these odors and their underlying causes, it’s important to tackle moisture issues at their source. Proper ventilation, dehumidification, and fixing leaks or plumbing problems can help prevent mold growth and the development of foul odors.. Regular inspections of crawlspaces and addressing pest infestations promptly are also essential steps. If odors persist or if there are concerns about indoor air quality and respiratory health, consulting professionals such as mold remediation experts or indoor air quality specialists can provide guidance and solutions.

Certain smells of newly manufactured products can permeate for days or weeks after entering your home. New carpet, new paint, new fiberboard furniture, new flooring, mattresses, and especially the packaging materials these items are delivered in comes from the release of VOCs. These include chemicals like formaldehyde, benzene, and toluene, styrene, ethylene and other solvents which are emitted as gasses into the air. These compounds can create the distinct odor that many associate with new items or newly installed solid flooring. While the smell itself might not necessarily be harmful at low levels, prolonged exposure to these VOCs can potentially lead to indoor air quality concerns and respiratory discomfort. Proper ventilation and allowing the carpet to off-gas in a well-ventilated space can help reduce the intensity of the odor and minimize potential health effects. It is recommended to ventillate with windows open and fans running such new installations for at least 72 hours. I personally have seen cases of new carpet odor lasting months after a new install.

Yes, there are proven health effects of moderate volatile organic compound (VOC) exposures on humans. While short-term exposure to low levels of VOCs might not immediately cause severe health effects, cumulative or repeated exposures can lead to various health issues, even at moderate levels.

Respiratory Irritation: VOC exposure can cause irritation of the eyes, nose, and throat. It may lead to symptoms such as coughing, sneezing, and a runny nose.

Aggravation of Respiratory Conditions: People with preexisting respiratory conditions like asthma can experience worsened symptoms due to VOC-exposure. VOCs can trigger asthma attacks and make breathing more difficult.

Headaches and Dizziness: Some individuals might experience headaches, dizziness, and general discomfort when exposed to moderate levels of VOCs.

Allergic Reactions: Certain VOC’s can act as sensitizers, leading to allergic reactions in some people upon exposure.

Long-Term Effects: Prolonged exposure to moderate levels of VOCs has been linked to more serious health issues, including damage to the central nervous system, liver, and kidneys. Some VOCs are classified as carcingens, meaning they have the potential to cause cancer with prolonged exposure.

Dr. Rogers

It’s important to note that the impact of VOC exposure can vary based on factors such as the individual’s sensitivity, the specific chemicals present, the duration and intensity of exposure, and the overall ventilation of the environment. To minimize health risks, it’s advisable to choose products with lower VOC emissions, ensure good ventilation in indoor spaces, and limit exposure to products that emit strong odors.

Improving ventilation in homes is crucial to limit the accumulation of volatile organic compounds (VOCs) and maintain indoor air quality. Here are several effective strategies to enhance ventilation and reduce VOC exposure:

  1. Natural Ventilation: Open windows and doors when weather permits to allow fresh outdoor air to circulate through your home. Cross-ventilation, where air flows in from one side and exits on the other, can be particularly effective.
  2. Mechanical Ventilation Systems Install mechanical ventilation systems like exhaust fans in kitchens and bathrooms. These systems help expel indoor air, along with any pollutants, directly outdoors.
  3. Use of Air Purifiers: High-quality air purifiers equipped with HEPA filters and activated carbon can help remove VOCs from the air. Make sure to choose a purifier appropriately sized for the room it’s placed in.
  4. HVAC Systems with Air Exchange: Modern heating, ventilation, and air conditioning (HVAC) systems with air exchange capabilities provide controlled ventilation. These systems bring in fresh outdoor air while expelling stale indoor air, helping dilute pollutants.
  5. Ventilation during Activities: Activities that release VOC’s, such as painting, cooking, or using cleaning products, should be conducted with proper ventilation. Open windows and turn on exhaust fans to quickly remove pollutants.
  6. Ventilation Strategies during Construction: If you’re remodeling or building, consider low-VOC materials and strategies that enhance ventilation during and after construction, such as sealing off construction areas from occupied spaces and using air filtration systems.
  7. Limiting Sources of VOCs: Choose products with low or no VOC emissions, such as low-VOC paints, adhesives, and furniture. Look for products labeled as “Green Seal” or “GreenGuard” certified, as these tend to have lower emissions.
  8. Air Out New Items: Allow new furniture, carpets, and other items to off-gas in a well-ventilated area before bringing them into your living space.
  9. Sealants and Caulking: Properly seal gaps, cracks, and joints in your home’s structure to prevent the infiltration of outdoor pollutants and to minimize indoor VOC accumulation.
  10. Regular Cleaning: Regularly clean your home to reduce dust and dirt that can trap VOCs. Use environmentally friendly cleaning products to avoid adding more pollutants.

Remember, the goal is to achieve a balance between minimizing VOC exposure and maintaining a comfortable indoor environment. Tailor these strategies to your specific situation and lifestyle to create a healthier living space.

Temperature and humidity play significant roles in shaping home odors and the behavior of VOCs. Understanding the interaction between these factors is essential for maintaining indoor air quality and a comfortable living environment.


Temperature influences the rate of VOC emissions and chemical reactions that contribute to indoor odors. Higher temperatures can accelerate the release of VOCs from various sources such as furniture, cleaning products, and building materials. This phenomenon is known as “off-gassing.” Warmer temperatures can also lead to the increased evaporation of solvents in paints, adhesives, and finishes, releasing more VOCs into the air. Consequently, during hot weather, indoor VOC concentrations can rise, intensifying odors and potentially affecting indoor air quality.

On the other hand, lower temperatures might slow down the release of VOCs. However, this can lead to a delayed but concentrated release once temperatures rise again. Ventilation becomes crucial in managing temperature-related VOC emissions. Adequate air exchange helps dilute VOC concentrations, mitigating their impact on indoor air quality and odors.


Humidity, or the moisture content of the air, can significantly affect both the generation of odors and the behavior of VOCs:

  1. Moisture and Odor: High humidity levels can create favorable conditions for mold and mildew growth. Mold produces musty odors and releases microbial volatile organic compounds (MVOCs), contributing to unpleasant smells. Excess moisture can also activate chemical reactions that produce odors, especially in organic materials.
  2. VOC Sorption: Humidity can impact the absorption and adsorption behavior of VOCs. Certain materials have a higher affinity for moisture, allowing them to adsorb VOCs from the air. In high humidity, these materials might release previously adsorbed VOCs back into the air, leading to heightened odors.
  3. Chemical Reactions: Humidity can trigger chemical reactions involving VOCs and other compounds. These reactions can result in the formation of secondary pollutants and new odorous compounds. For instance, formaldehyde emissions from pressed wood products can increase with elevated humidity levels.

To manage the effects of temperature and humidity on home odors and VOCs:

  • Ventilation: Proper ventilation is crucial year-round. During warmer periods, effective ventilation helps remove VOCs and prevent the buildup of odors. In humid conditions, ventilation reduces moisture levels, hindering mold growth and associated odors.
  • Dehumidification: Using dehumidifiers can help maintain indoor humidity within a comfortable and safe range, preventing excess moisture that can lead to mold growth and odor issues.
  • Temperature Control: Maintain a consistent indoor temperature to minimize fluctuations that can trigger VOC emissions. Avoid extreme temperature variations that might lead to concentrated off-gassing.
  • Source Control: Choose low-VOC or VOC-free products and materials to reduce the initial VOC load in your home. Properly seal materials that emit VOCs, like insulation and flooring, to prevent their release.
  • Regular Cleaning: Regular cleaning helps eliminate dust and dirt that can trap VOCs and contribute to odors. Focus on areas prone to moisture buildup, like bathrooms and kitchens.

By carefully managing temperature and humidity, you can create a more comfortable and healthier indoor environment while minimizing the impact of odors and VOCs.

VOC levels can vary in both older and newer homes depending on various factors such as building materials, furnishings, ventilation systems, and maintenance practices. Generally, newer homes tend to have the potential for higher VOC levels due to several reasons:

Newer Homes:

  1. New Materials: Many modern building materials, paints, adhesives, and finishes used in newer homes can emit higher levels of VOCs. These materials might off-gas more initially, contributing to the “new house smell.”
  2. Tighter Construction: Newer homes often have more airtight construction for energy efficiency. While this is beneficial for reducing energy consumption, it can also lead to the accumulation of indoor pollutants, including VOCs, if there isn’t sufficient ventilation.
  3. Furniture and Decor: Newer homes might have more newly purchased furniture and decor items, which can emit VOCs. These items often off-gas initially and contribute to indoor air pollution.

Older Homes:

  1. Aging of Materials: In older homes, some of the materials that might have emitted higher levels of VOCs when new could have already released a significant portion of their VOCs over time. This could potentially lead to lower VOC levels compared to the initial off-gassing phase.
  2. Ventilation: Older homes might have less airtight construction, which can allow for more natural ventilation. While this might help in reducing VOC levels, it also depends on the homeowner’s practices in terms of keeping windows open for fresh air exchange
  3. Renovation and Retrofitting: Older homes that have undergone renovations might have newer materials and products incorporated, contributing to increased VOC emissions.
  4. Building Codes and Regulations: In some regions, building codes and regulations might have evolved to promote the use of low-VOC materials in newer homes, which could help mitigate initial VOC emissions.

It’s important to note that VOC levels can vary widely depending on individual factors. Factors such as the specific products and materials used, how well the home is ventilated, the presence of indoor sources (like cleaning products), and the activities conducted within the home all play roles in determining indoor air quality. To ensure a healthy indoor environment, regardless of the age of the home, it’s advisable to choose low-VOC or VOC-free products, maintain proper ventilation, and keep indoor spaces clean and well-maintained.

Other common odors

Animal urine odor in homes can be exceptionally problematic and insidious, particularly when it has seeped into subfloors. The pungent smell of urine can persist even after cleaning, permeating the air and making living spaces uncomfortable and unpleasant. If left untreated, the odor can linger for a long time, affecting indoor air quality and overall well-being.

When urine penetrates subfloors, it can be absorbed by porous materials, such as wood and concrete. This absorption makes it extremely challenging to completely eliminate the odor using regular cleaning methods. Moreover, as temperatures and humidity levels fluctuate, the odor can intensify, releasing volatile compounds into the air. This not only causes discomfort but can also have adverse effects on respiratory health, triggering allergies and exacerbating respiratory conditions.

The insidious nature of animal urine odor lies in its ability to become embedded deep within the structure of the home. It’s not just a surface issue; it’s a problem that can persist over time, leading to frustration and potential property value reduction.

Addressing this issue often requires professional intervention. Remediation may involve thorough cleaning, disinfection, and sometimes even the removal and replacement of affected materials. Effective ventilation and proper sealing are crucial to prevent the odor from re-emerging. Taking swift action is essential to prevent the long-lasting and negative impact of animal urine odor on the home environment.

Other airborne pollutants

Particulate matter (PM) refers to tiny airborne particles suspended in the atmosphere, originating from various sources such as combustion processes, vehicle emissions, industrial activities, construction, and natural sources like dust and pollen. Particulate matter is categorized based on its size, with PM2.5 and PM10 being two important classifications.

PM2.5 (Fine Particulate Matter): PM2.5 refers to particles with a diameter of 2.5 micrometers or smaller. These particles are so small that they can easily penetrate deep into the respiratory system and even enter the bloodstream. They consist of pollutants like sulfates, nitrates, organic compounds, and metals. Wildfires, vehicle exhaust, industrial emissions, and cooking are significant sources of PM 2.5.

Exposure to PM2.5 is associated with a range of adverse health effects. The small size of these particles enables them to bypass the body’s natural defense mechanisms and reach the lungs’ alveoli. This can lead to respiratory issues such as aggravated asthma, bronchitis, and reduced lung function. Long-term exposure has been linked to cardiovascular diseases, lung cancer, and premature death. Vulnerable populations such as children, the elderly, and individuals with preexisting health conditions are particularly at risk.

PM10 (Coarse Particulate Matter): PM10 includes particles with a diameter of 10 micrometers or smaller. These particles are larger than PM2.5 and can be inhaled into the upper respiratory tract. PM10 consists of various materials including soil, dust, pollen, and larger combustion-related particles.

While PM10 particles generally don’t penetrate as deeply into the lungs as PM2.5 particles, they can still cause health issues. Short-term exposure to PM10 can result in irritation of the eyes, nose, and throat. It can exacerbate respiratory conditions and trigger allergic reactions. Long-term exposure may also lead to chronic respiratory problems.

The effects of particulate matter, whether PM2.5 or PM10, are especially pronounced during episodes of elevated pollution, such as wildfires or heavy dust storms. These events can lead to “bad air quality days,” impacting not only human health but also visibility and overall environmental quality.

To mitigate the effects of particulate matter on air quality and public health, various strategies can be employed. Implementing stricter emission controls on vehicles and industrial sources,, promoting clean energy alternatives, enforcing dust control measures in construction sites, and raising public awareness about indoor air quality improvement are all important steps. Additionally, individuals can protect themselves by staying indoors during high pollution events, using air purifiers, and wearing proper masks when needed. Monitoring and addressing particulatte air quality is crucial for maintaining a healthier and more sustainable environment for all.

Measuring Pollution and VOC’s

Consumer devices that measure VOCs (volatile organic compounds) and particulate pollution levels have become increasingly popular tools for individuals concerned about indoor air quality. These devices offer valuable insights into the presence of potentially harmful pollutants in the air we breathe.

For VOC measurements, portable sensors are available that can detect and quantify the concentration of various VOCs in real-time. These devices often use technologies like metal-oxide sensors or photoionization detectors to provide instant feedback on indoor pollutant levels. They allow users to identify sources of VOC emissions and make informed decisions about product choices and ventilation practices.

Similarly, consumer-grade particulate pollution monitors utilize laser-based particle counters to measure the concentration of PM2.5 and PM 10 particles in the air. These devices offer real-time data, helping users understand the quality of the air they’re exposed to. They are particularly useful for people living in areas prone to dust storms, wildfires, or heavy traffic.

While these devices can provide valuable insights, it’s important to note that their accuracy might vary compared to professional-grade equipment used by regulatory agencies. I have found that there are no affordable devices to measure VOC’s in the home. Inexpensive devices are very unreliable and lack calibration. 90% of noses are better at sniffing out VOC’s than these inexpensive sensors. Professional devices exist and are expensive, and require regular professional calibration. They are useful for an evaluation periodically but not practical to have on-hand at home. The devices are better at measuring particulate matter (PM2.5 and PM10) especially during wildfire season. Consumer-grade empower individuals to proactively manage their indoor environments and take steps to improve air quality, which can have positive impacts on overall health and well-being.