What Is A High Mold Spore Count? Everything You Need To Know

Helen Skeates
Helen Skeates
41 min read

For those who have had their home recently tested for mold spore counts, you may be wondering, “what does a high mold-spore count mean?” An location with a high concentration of mold spores should have a count of more than 10,000.

In contrast to mold colonies, spores and poisons are far more difficult to remove from a surface. As a result, instead of doing your own cleaning, hire a cleaning company.

It is important to know how much mold is in an area before deciding how to deal with it. The categories are based on the total number of molds found following testing and inspection.


Levels Of Mold Infestation

1. Extremely clean

A mold count of 0 to 50 spores is not a problem at this low level. Stachybotrys and Memnoniella, on the other hand, are elevated genuses even at this level.

2. Low level

The spore count is between 51 and 500 spores in this group, which is still highly clean.

3. Acceptably clean

Mold spore concentration in this category ranges between 501-1500 spores. Standard cleaning and wiping can bring it down.

What Is A High Mold Spore Count? 9 Levels To Look Out For - Krostrade

Penicillium, Aspergillus, and Cladosporium spore concentrations can be found here.

4. Slightly elevated level

Spore concentrations of 1501-3000 may suggest the presence of an indoor reservoir, according to the CDC. To determine if cross-contamination is taking place, the indoor reading must be compared to an outside reading.

More than 100 counts per cubic meter must be found in order to determine whether or not there is an active fungal growth nearby. These levels are a result of neglect and a lack of cleaning.

Regular cleaning and wiping would reduce the concentration.

5. Moderate level

The concentration could be reduced with regular washing and wiping.

In this case, the lack of upkeep and dusty conditions are to blame. If the space is sanitized, there may be a hidden mold infestation..

Mold mapping can reveal the locations of these unseen fungi. Those who are really sensitive to these levels may feel some discomfort if they are exposed for an extended length of time.

6. Moderate to high level

This is the level at which some sort of cleanup is usually required. The spore count ranges from 4501 to 10,000.

Cleaning and confirming the presence of active fungus is comparable to the category before it. There is also a lack of ventilation and a relative humidity of more than 60% that contribute to the high mold count.

Mold can be lessened with the use of a fungus fogging technique. Even those with a healthy immune system may have some side effects from long-term exposure.

7. High level

This group has a hyphal fragment concentration of more than 100 per cubic meter. There are between 1000 and 2500 spores per square foot.

If there is visible mold contamination, cleaning is a necessary. If there is no fungal growth, there is a concealed fungus.

More than 60% of the time, the relative humidity will be high. As most people with a normal immune system would have symptoms after prolonged exposure, some kind of access restriction may be necessary.

8. Very high level

At this level of contamination, a professional mold remediator is almost certainly required. 25001-75000 spores are present, and the spores are often greater than 100 square feet in size.

In addition, the hyphal fragment concentration in the air has risen to 100 per cubic meter. Restrictions may be imposed in the affected region.

Due to extended exposure, almost everyone with a healthy immune system will experience symptoms.

9. Extremely high level

A professional mold mediator is necessary at this level. The spore count is 75000-1000000 and may grow to more than 100sf.

At this point, a trained mold mediator is required. The spore count ranges from 75000 to 1000000 and can reach up to 100sf in size.

For more information on how to interpret mold test results, you can refer to web articles. You may also want to check out this simple instruction on how to get rid of mold spores in the air.

What are the dangers of having a high mold count?

In the last part, we mentioned that mold spores can cause a variety of symptoms in those who are exposed to them for a lengthy period of time. I’m curious to know what the symptoms are.

The following is a list of possible allergic reactions in people after being exposed to mold over an extended time period:

  • Watery eyes
  • Face flushed with tears
  • Sneezing
  • Coughing
  • Wheezing
  • Breathlessness.
  • Headache
  • Fatigue

The aforementioned signs and symptoms are not severe. Once a person is exposed to mycotoxins (toxins produced by fungi), the consequences are worse.

The symptoms listed above are not severe. As soon as a person is exposed to mycotoxins, the effects become more severe.

What is Considered A Normal Mold Count?

An average number of mold spores in a room is between 200 and 500. It is typical and safe for a room to have anything from 1 to 1500 mold spores as long as mold colonies are not seen growing and there is no water damage to the room.

Mold spores are present in virtually every room of every building. These tiny spores can appear in a variety of forms. Everything from the clothes you’re wearing to the breeze coming in through the window.


Almost every room in a building contains mold spores. These tiny spores can appear in a variety of forms. Everything from the clothes you’re wearing to the breeze coming in through the window.


It’s impossible to avoid mold spores in every room in a building. Numerous forms of these tiny spores have been documented. From the clothing off your back to the breeze coming in through an open window.


Another prevalent mold that causes allergies.


This is the most frequent type of watermark used to signify damp paper or wallboard.


Not all sub-species of the most prevalent toxic mold are toxic. To thrive, many species require access to a nearby body of water.


Stachybotrys’ cousin. As the two organisms coexist, it is presumed that they are harmful.

Mold spore species and levels vary from state to state, making consensus among analysts and scientists difficult. The rule of thumb is to compare an indoor air sample to an outdoor air sample. For the following mold spore ranges, “Air Sample Report” interpretations use the spore/m3 number rather than the raw count for each species.

What Is Considered A High Mold Count?

0-50 spores

These minuscule concentrations aren’t a problem. Samples with high levels of Penicillium/Aspergillus and Chaetomium and Fusarium water indicators are not considered a concern if Stachybotrys is present.

50-200 spores

Toxic mold species Stachybotrys and Memnoniella are the only ones causing concern at these levels, which are still extremely low.

200-500 spores

Curvularia, Penicillium/Aspergillus, and Cladosporium, the three most prevalent species, pose no threat and are within the usual range.

500-1500 spores

When the levels of Penicillium/Aspergillus and Cladosporium are in this range, no action is needed to correct the situation. Normal existence in an enclosed space can create these levels if water infiltration or mold was not identified during the inspection.

1500-3000 spores

An issue may be obvious unless a similar figure appears in the outdoor sample. In the absence of evidence of water penetration or mold growth, a dusty residence or an air conditioning system can achieve these standards.

3000-10,000 spores

Without a corresponding number in the outdoor sample, some remediation is necessary. A perimeter clean-up is needed if a mold spore source has been identified. If water intrusion or mold issue wasn’t found, the home may need to be cleaned and the duct system should be evaluated.

10,000-25,000 spores

Outdoor samples must be supplemented if there is no comparable number in the indoor sample Whenever mold spores have been found, a perimeter clean-up is necessary. If no signs of water damage or mold growth are identified, the house may need to be cleaned and the duct system examined.

25,000-75,000+ spores

It will be simple to spot whether there is a mold problem. A professional mold remediator should be called in to clean up the mess.

75,000-1,000,000+ spores

Mold growth will be obvious. A professional mold remediation company, like United Water Restoration Group, Inc., will be needed to do the remediation.

What are pollen and mold counts?

Do you know where your local weather station gets its pollen and mold count data? Seasonal rhinitis, often known as hay fever, can be exacerbated by the amount of pollen and mold spores in the air, which can affect the intensity of allergy symptoms. It is feasible to plan to limit exposure to airborne allergens by using pollen and mold counts to determine the concentration of plant pollen or mold spores in the air at a given moment.

National Allergy Bureau reports that researchers employ 24-hour pollen and mold spore collection equipment to quantify pollen and mold counts. After that, they examine the sample under a microscope to see what kinds of pollen and mold spores are in the air and what concentrations there are. The pollen count for that day is calculated using extrapolation of the results.

Pollen counts are displayed in a variety of ways, but most organizations utilize a set of classifications to determine how much airborne pollen and mold can affect a person’s allergy symptoms on any particular day. If you know the grass, trees, and weeds you’re most sensitive to, it might be quite helpful to look up pollen and mold levels in the air on various websites.

How should you interpret conflicting pollen and mold counts?

All pollen counting methods and websites are not the same. The number of pollen and mold spores found in a sample can vary depending on the sampling method used, the amount of time the sample was collected, and the method utilized for analysis.

How Mold Grows and More: Your Mold Questions Answered - Wet & Forget Blog

There are many different classification systems utilized by different organizations when it comes to reporting pollen and mold counts. For instance:

  • The National Allergy Bureau (NAB) releases a daily regional pollen and mold report based on data collected over the course of a 24-hour period. Each category is broken down into absent, low, moderate, high, and extremely high pollen and mold counts. Based on pollen and mold concentrations in the air, each classification has a different name. Pollen counts are also broken down into species of trees, weeds, grass, and mold in NAB reports.
  • For allergy sufferers, Pollen.com offers prognoses based on pollen levels in the past and present, as well as local meteorological conditions. A scale of 0–12 is used to rate pollen levels, with low, medium, medium-high and high representing the level of pollen exposure you may expect during a specific period. According to Pollen.com, the most common allergies in your area are listed along with a forecast for the next day.
  • The Weather Channel has an Allergy Tracker that uses social media data in your area to provide information on allergen levels and forecasts. On the website, tree, grass, ragweed and mold spore pollen levels are listed as none, low, moderate, and high. If you’re concerned about the accuracy of the pollen counts provided by the Weather Channel, you may wish to check them against other sources. The channel only says that the pollen counts come from “local pollen reporting stations.”

Comparison of different organizations’ reporting techniques is useful when comparing mold and pollen data. Weather patterns and historical pollen counts are often used to make pollen forecasts, which may differ from the actual pollen data collected by scientists in the field. It is possible that real-time pollen data is more precise, but as it is usually calculated over a 24-hour period, it may not accurately reflect the most recent pollen and mold levels on a given day. Seasonal allergy sufferers can benefit from pollen and mold reporting of many kinds.

What causes high pollen and mold counts?

Pollen and mold levels can fluctuate dramatically over time, which is why so many organizations are worried about monitoring them. Many factors can affect the amount of pollen and mold in the air that we inhale, even though seasonal allergies tend to cycle. Some examples are as follows:

  • Pollen and mold growth are affected by regional climate differences, and vice versa. The American Academy of Allergy, Asthma & Immunology (AAAAI) states that pollen and mold production may decrease in colder climates throughout the winter, whereas warmer climes may be able to detect these airborne allergens throughout the year. Depending on where you reside, you may have better or worse luck with mold growth because of the climate.
  • Each year, certain forms of pollen are more prevalent throughout certain seasons. While tree pollen is more prevalent in the early spring, grass pollen is more common in late spring and early summer, and weed pollen can produce allergy symptoms in the late summer and early autumn.
  • Cloudy or rainy days tend to be less pollen-inducing for allergy sufferers, as pollen moves best at high temperatures with low humidity. Pollen and mold spread more easily in the air when it is windy outside.
  • Pollen concentrations tend to be highest in the early morning hours because different plants release their pollen at different times of the day. Between the hours of 5 a.m. and 10 a.m., the NIH advises people to stay indoors. Pollen levels are often lower at night, however this may not always be the case. Birch pollen counts were found to be roughly comparable in the morning and evening, according to one study (Grewling, Bogawski & Smith, 2016). At night, quantities of a particular form of ragweed pollen were found to be higher.

Managing your pollen and mold allergy symptoms

Itchy or watery eyes, throat irritation, and wheezing are all signs of allergies caused by pollen and mold in the air. The intensity of your seasonal allergies and the concentration of allergens that you are exposed to on a given day will determine the symptoms that you will experience. Allergies can’t be treated, but limiting your exposure to pollen and mold in the air can help ease your symptoms.

  • On days with lower pollen and mold concentrations, schedule outside activities. When pollen levels are lower, it’s best to spend time outside later in the day or after a big rain.
  • On days when pollen counts are high, keep your windows closed and use central air conditioning to keep your home’s air clean and dry. When driving by car, keep the windows closed if you can’t avoid going outside.
  • You may want to avoid specific regions during peak pollen and mold seasons if you are sensitive to seasonal allergens. Determine the ideal time of year to travel based on pollen and mold trends in the locations you plan to visit.
  • On days when the pollen count is high, stay indoors and avoid yard work, gardening, and clothes drying in the sun.

You may need to take care to decrease your exposure at different reported allergen levels than others around you if you are sensitive to airborne pollen and mold. The good news is that there are several organizations that make it easy for you to monitor pollen and mold spore counts in your area, allowing you to plan ahead and avoid aggravating your allergies.

21 Critical Mold Statistics We Have to Be Aware

The Top 10 Mold Statistics and Facts

  • Keeping the relative humidity below 50% is an effective way to avoid the growth of mold.
  • Children under the age of five die from air pollution-related illnesses nearly every year.
  • Dampness and indoor mold contribute $3.7 billion to the annual cost of rhinitis caused by allergic rhinitis.
  • The term “poison mold” refers to black mold.
  • According to intriguing facts about mold, 30 percent of new and refurbished buildings may have IAQ issues.
  • A total of 270 species of mold have been found in buildings in Canada.
  • Mold can begin to grow within 24–48 hours of water damage.
  • A soil-dwelling amoeba, slime mold is a common weed killer.
  • There are an estimated 25 percent of the world’s food crops contaminated by mycotoxins.
  • Gorgonzola, Brie, and Camembert can all benefit from food molds.

General Statistics on Mold and Air Pollution

Mold is found in approximately 70% of homes. There is also a genetic predisposition to mold-related health issues that affects roughly 28 percent of the population. Just a few of the startling statistics that can be found inside this area.

1. If you’re wondering what percentage of homes have mold, the answer is around 70%.

For homeowners, this is a horrifying fact. However, no one knows exactly how much mold is present in the average home. In addition, statistics show that Stachybotrys spores can be found in the vast majority of residences around the world. Mold is found in up to 9 percent of Finnish terraced houses, 18 percent of Finnish kindergartens and schools, and 26 percent of Finnish hospitals, outpatient departments, and nursing homes, according to the Audit Committee of the Finnish Parliament.

2. Mold statistics for the US show that the annual cost of allergic rhinitis caused by dampness and indoor mold is $3.7 billion.

According to research, acute bronchitis costs $1.90 billion, whereas asthma mortality costs $1.7 billion. The willingness to pay (WTP) and cost of disease approaches were used to estimate the costs (COI).

3. Every year, almost 600,000 kids under the age of 5 die from illnesses caused by air pollution.

Respiratory disorders impact the cognitive and physical development of millions of youngsters every year. One in ten children under five dies from respiratory ailments connected to air pollution and indications of mold sickness, according to statistics on mold-related deaths. Those with compromised immune systems, allergies, or asthma are more vulnerable to the negative effects of mold spores and mold. Mold poisoning is a terrifying topic to contemplate.

4. The three most frequent indoor molds are Aspergillus, Penicillium, and Cladosporium, home mold statistics reveal.

Molds can develop on a wide variety of materials outside the obvious suspects like window panes, pipe fittings, and even roofs. Unfortunately, there is no way to tell exactly how frequently molds like this appear in buildings and homes. Keep an eye out for mold, whether you’re a homeowner or a renter.

Environmental mold, according to scientists interviewed for the 2015 documentary “Moldy,” poses a greater threat to human health than lead or asbestos paint. Statistics reveal that hidden mold is most commonly found under leaking roofs, crawl spaces, and beneath improperly placed showers, among other places.

Stats and Facts on Black Mold

Here, we’ll take a look at some of the most harrowing facts about black mold.

6. Black mold is sometimes referred to as toxic mold.

It is possible that exposure to black mold can result in death from the mycotoxins that induce memory loss, nosebleeds, and pains. Inflammation, allergy, infection, and mycotoxicosis can all be caused by black mold or Stachybotrys chartarum.

7. According to black mold facts, mold growth can be prevented by keeping humidity levels below 50%.

Mold can only grow to their maximum potential in moist, humid environments. A dehumidifier may be necessary to keep the air in your home dry. Cleaning surfaces regularly, addressing mildew and mold as soon as they appear, and avoiding the use of carpet in bathrooms or basements are all good safeguards that homeowners may take. If you’re planning on remodeling your home, this is something to keep in mind.

8. With 21%, Dallas is the first on the list of US cities with the highest number of allergy patients sensitized to mildew and mold, according to black mold statistics by city.

Riverside-San Bernardino comes in second with 20% of allergy patients susceptible to mold and mildew, followed by Phoenix with 19% and Los Angeles with 17%. This information comes from a Quest Diagnostics study of participants seeking medical attention for mold allergy symptoms.

Stats on Buildings With Mold

Mold will be discussed in this section as it occurs in many different types of structures all around the world.

9. The percentage of possible IAQ issues in remodeled and new buildings is 30%.

Indoor air quality (IAQ) can suffer as a result of mold infestations in buildings, which can lead to respiratory and other health issues. According to data on mold-infested structures, a ten-year-old condominium complex had to fork over $4 million in repair charges.

10. In Canada, experts identified 270 different species of mold in buildings.

Commercial and residential properties are infested with at least 271 mold species known to man. The use of moisture control measures is especially advised for training facilities and grocery stores, as these buildings may have elevated amounts of moisture.

11. Following water damage, mold takes around 24–48 hours to form.

In the event of water damage from an accident, a flood, or a leaky ceiling, the mold statistics show that fast treatment is the best course of action. Stains and patches on carpets, for example, need to be cleaned up as away. Using too much water when cleaning carpets or other surfaces is also a bad idea.

12. Get professional help if the moldy area is larger than 3 square feet.

An infection greater than three square feet should be cleaned by a professional even if minor mould issues can be handled by inexperienced people. According to the mold facts, this is because a more severe mold infection can be even more dangerous. It’s important to keep in mind that commercial black mold removal services aren’t cheap.

Facts About Slime Mold

Take a peek at this page to learn more about slime mold and its various characteristics.

13. Slime mold is an amoeba living in the soil.

Slime mold is neither a plant nor an animal. And despite its resemblance to a fungus, it is not one. An organism known as slime mold is a single-celled, brainless cell with numerous nuclei.

14. Interesting facts about slime mold reveal that they come in all colors except green.

Slime mold can emerge in every color except green, according to Steve Stephenson, a biology lecturer at the University of Arkansas. Slime mold does not contain chlorophyll, which would otherwise give it a real green hue.

15. There’s a type of slime mold known as ”dog vomit.”

From blackberries to hexagonal lattices, slime mold can take on a variety of forms. In the world of slime molds, “dog vomit” mold has been dubbed the most mysterious of them all. The length of slime mold can range from 10 to 13 feet, although it can also be minuscule.

16. There are over 900 species of slime mold.

Every continent is home to at least one kind of slime mold, according to biology professor Frederick Spiegel. It is more likely to be found in forests, where it feeds on fungi, bacteria, and decaying plant and decomposes it.

17. Facts about mold reveal that slime molds likely inspired the 1958 sci-fi movie “The Blob.”

Residents of the Pennsylvania towns of Downingtown and Phoenixville are being devoured by an amoeboid alien organism known as “The Blob.” It grows in size as it devours its victims. Slime molds, when they’re plasmodial, can spread like wildfire and resemble an interstate highway system.

Food Mold Facts

Learn about the dangers of several varieties of food mold.

18. An estimated 25% of the global food crops are affected by poisonous substances known as mycotoxins.

Nut and grain crops, as well as grape juice, celery, and apples, can include mycotoxins, which are formed by a variety of molds present in these foods. In peanuts and field corn, aflatoxin is a form of mycotoxin known to cause cancer. Aflatoxin has also been linked to diseases including domestic animal aflatoxicosis and human aflatoxicosis.

19. Cheese mold facts reveal that food molds can be beneficial for making Gorgonzola, Brie, and Camembert.

Food mold can be useful in the production of a variety of cheeses, and it can be formed either internally or externally. Penicillium roqueforti spores are used to manufacture “blue-veined” cheeses like Stilton, Roquefort, and Gorgonzola. You need to know that the molds used to make cheese are perfectly safe to eat.

20. Bread mold can be prevented by freezing the bread.

Bread mold facts suggest that freezing the bread will keep it clear of the fungus. However, putting the bread in the refrigerator will not stop the fungus from spreading. As a result, freezing the bread and thawing it as needed is a good idea.

21. Bread mold can cause dangerous infections, especially in people with weaker immune systems.

Here’s the solution to your question: Bread with fuzzy mold bits is okay to eat. Discard that loaf of bread! Aspergillus, Fusarium, and Rhizopus are the three most frequent molds found on bread, according to bread mold statistics. Aside from allergies, bread mold can cause breathing issues like asthma.

Mold spores Stock Photos, Royalty Free Mold spores Images | Depositphotos


What are the symptoms of mold exposure?

Symptoms of black mold exposure include respiratory problems, coughing, stuffy nose, red or itchy eyes, sore throat, and skin rashes.

How to treat a mold allergy?

Get rid of the source, or wear an allergy relief mask when working outside, and the problem is solved! Consider hiring a professional mold inspector if mold is found in your house. Consult an allergist about possible immunotherapy sessions for mold allergies.

How much mold exposure is dangerous?

Your health and the structure of your home are both negatively impacted by mold growth. Mold spores can be ingested, inhaled, or touched to make someone sick.

Despite the fact that persons with allergies, respiratory issues, and weakened immune systems are more vulnerable to mold’s ill effects, some people who are exposed to mold do not. To avoid long-term health risks, we recommend getting rid of the mold as soon as feasible.

Has mold killed anyone?

As a result, mold can pose a danger to those who are extremely young, elderly, or have weakened immune systems. Aside from causing allergies, asthma and other respiratory ailments, mold pollutes the air. Stachybotrys and Penicillium both have the potential to cause lung hemorrhaging when exposed to their respective mycotoxins.

How long does it take for mold to affect you?

Exactly how long mold takes to affect a person is uncertain. Statistically, mold may have no effect on certain persons. Pre-existing medical disorders like asthma, on the other hand, might have a significant impact on some people. You can’t tell if you’ve been exposed to mold by doing a test.

What is acceptable mold spore count?

What is a “Normal” Mold Count Level? There are usually between 200 and 500 mold spores per square foot in a typical room. It is typical and safe for a room to have anything from 1 to 1500 mold spores as long as mold colonies are not seen growing and there is no water damage to the room.

What is a high mold count?

During the warmer months, mold spores circulate through the air like pollen. A spore count of 1 to 6,499 is low. A moderate spore count ranges from 6,500 to 12,999. A spore count of 13,000 to 49,999 is considered high. Mold Facts & Figures: The Ten Most Important

How do you read mold test results?

Generally speaking, persons who are sensitive to molds are affected by levels between 8 and 30 ng/L. This indicates that there is a significant level of active mold growth, and that practically all of the home’s residents are likely to be impacted by it.”

What is a high level of Aspergillus?

Aspergillus, Cladosporium, and Curvularia spores (200-500 spores) are normally not a problem, as they are within the normal range. Sometimes Penicillium/Aspergillus & Cladosporium levels are in this range and don’t need cleanup. 500-1500 spores per milliliter

What is a high count of Aspergillus?

More than 1000 cfu per cubic meter of air indicates a high level of contamination. Stachybotrys and/or Chaetomium spore counts of 48/m3 of air are often considered abnormally high. As a result, this mold is not generally airborne. However, the presence of 200 Aspergillus sp. was found.

How does high mold count affect you?

For persons who are susceptible to mold, high mold counts can cause symptoms including congestion, sneezing, a runny nose, and watery, itchy eyes.

Can high mold counts cause headaches?

Even if you don’t have any other symptoms of allergies, pollen, mold, and pet dander might trigger a sinus headache if your body’s immune system overreacts.

What causes high mold spores in the air?

Dry, windy weather favors the transmission of some spores, while high humidity favors the spread of others via fog or dew. It’s best to avoid exposure to mold spores at night, especially if it’s humid or raining. When mold spores are disturbed, they are released into the air, where they might cause an allergic reaction in those who are allergic to mold.


Please let us know if we answered your question on “what is an excessive mold spore count?” If any of your family members are exhibiting any of the symptoms listed above, or if you see visible signs of a mold infestation, you should contact a specialist right away.

The Mold Spore Count Is High. There are a total of nine levels to keep an eye out for.

Helen Skeates

Helen Skeates

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