Why You Need A CO2 Meter For Growing Mushrooms


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A CO2 meter is a small but powerful device that can help you monitor and control CO2 levels in your mushroom growing environment, ensuring optimal conditions for your crops. With a CO2 meter, you can easily detect when CO2 levels are too high or too low, and make adjustments accordingly. This not only leads to healthier and more robust mushrooms, but can also increase yields and reduce the risk of contamination. 

If you are a mushroom farmer or someone who is interested in growing mushrooms, you may have heard about the importance of controlling carbon dioxide (CO2) levels in your grow room. 

Carbon dioxide is an important factor in mushroom farming because it affects the growth and yield of mushrooms. Too much CO2 can cause the mushrooms to grow too quickly, resulting in poor quality and low yield. On the other hand, too little CO2 can slow down mushroom growth and result in small or deformed mushrooms. Therefore, it is essential to measure and control CO2 levels in your mushroom grow room.

In this article, we will explore why you need a CO2 meter for growing mushrooms and how it can help you optimize your mushroom farming.

Mushroom Production In Grow Rooms

One of the most important factors in this process is managing CO2 levels. CO2 is essential for photosynthesis, but too much can be harmful to both the mushrooms and the workers in the grow room. Therefore, it is crucial to maintain optimal CO2 levels throughout the growing process.

Another essential element in mushroom production is the grow room itself. This space needs to be carefully designed and maintained to create the ideal environment for mycelium growth. Mycelium, the vegetative part of the mushroom, requires specific conditions to thrive, including consistent temperature, humidity, and airflow. You must carefully monitor and adjust these variables to ensure that the mycelium is healthy and productive.

In addition to environmental factors, the production process also involves careful attention to detail and sanitation. Therefore, you must make measures to prevent contamination, which can quickly ruin a crop. This involves sterilizing equipment and materials, as well as maintaining a clean and sterile grow room environment.

Do Mushrooms Need CO2?

Mushrooms are unlike plants, therefore, they do not need CO2 for photosynthesis. However, CO2 is critical for your mushroom’s growth to develop its fruiting body and for the mycelium to grow. Without the correct CO2 level, mushrooms will not grow properly in the vegetative phase.

We must also note that mushrooms still require CO2 for respiration. During respiration, mushrooms use oxygen and release CO2, like humans. Therefore, the correct CO2 level is needed for successful mushroom farming.

The Importance Of Measuring CO2 In Mushroom Farming

A key aspect of mushroom farming is the management of CO2 levels in the mushroom grow room. CO2 is a colorless, odorless gas that is produced by the mushrooms during the growth process. High levels of CO2 can have a detrimental effect on the mushrooms’ growth and yield. Therefore, it is crucial to measure and regulate the CO2 levels in the mushroom grow room to ensure optimal conditions for the mushrooms.

Do Mushrooms Give Off CO2?

Yes, mushrooms give off CO2 during respiration. The amount of CO2 released by mushrooms depends on the stage of growth and the number of mushrooms in the grow room. 

During the vegetative stage, mushrooms release more CO2 than during the fruiting stage. However, the CO2 released by mushrooms may not be enough to meet the required levels for optimal mushroom growth.

How Much CO2 Do Mushrooms Need To Grow?

The ideal CO2 level for mushroom growth is between 10,000 – 20,000 ppm during the spawning process, but no more than 1,000 ppm CO2 is needed during the fruiting phase. Therefore, we recommend a level between 500 and 800 ppm.

However, the CO2 level may vary depending on the type of mushroom and the stage of growth. For example, some mushrooms may require higher CO2 levels during the fruiting stage to promote the development of fruit bodies. Therefore, it is important to research the specific needs of your mushroom species and adjust the CO2 levels accordingly.

How To Control CO2 In Mushroom Grow Room

Maintaining the optimal CO2 levels in the mushroom grow room is essential for several reasons. Firstly, high levels of CO2 can lead to reduced oxygen levels, which can cause the mushrooms to grow slowly or even die. 

Secondly, low CO2 levels can result in stunted mushroom growth and reduced yields. Finally, maintaining optimal CO2 levels ensures that the mushrooms grow uniformly and are of high quality, which is crucial for commercial mushroom farming.

Controlling CO2 levels in your mushroom grow room can be achieved through ventilation and air exchange. Ventilation involves the use of fans and ducts to circulate air in and out of the grow room. Air exchange involves the use of fresh air from outside the grow room to replace the stale air inside. Both methods can help maintain the ideal CO2 level for mushroom growth.

There are several ways to control CO2 levels in a mushroom grow room. One of the simplest methods is to increase ventilation. Adequate air circulation can help reduce CO2 levels by allowing fresh air to enter the room, diluting the concentration of CO2. Installing fans and vents can help maintain a consistent flow of air, preventing stagnant pockets of CO2 from building up.

Another effective way to control CO2 levels is to use a CO2 scrubber. A CO2 scrubber works by absorbing excess CO2 from the air and releasing clean air back into the room. It is a highly efficient method of controlling CO2 levels, and can be used in conjunction with ventilation to achieve optimal results.

CO2 Controller For Growing Mushrooms

Another way to control CO2 levels in your mushroom grow room is by using a CO2 controller. A CO2 controller is a device that monitors and controls the CO2 level in the grow room. It measures the CO2 level and adjusts the ventilation or air exchange system to maintain the desired CO2 level. Using a CO2 controller can help you achieve consistent CO2 levels and optimize mushroom growth and yield.

In addition to these methods, it is also essential to monitor CO2 levels regularly. Using a CO2 meter, growers can keep track of CO2 levels and adjust the ventilation and scrubbing systems accordingly. 

CO2 Meter For Measuring Grow Rooms

To measure the CO2 level in your mushroom grow room, a CO2 sensor is used. A CO2 sensor is a device that measures the CO2 level in the air and displays the reading in ppm. It can be used to monitor CO2 levels in real-time and allows you to make adjustments accordingly. Using a CO2 sensor properly can also help you avoid under or over-exposure to CO2, and ensure optimal mushroom growth and yield.

The ideal CO2 range (typically 800 to 1500 ppm) is optimal for mushroom growth and ensures that the mushrooms have enough CO2 to support their development. Without adequate levels of CO2, the mushrooms may become stunted or even fail to grow altogether. Additionally, high levels of CO2 can be harmful to the mushrooms and can cause them to become discolored or deformed.

A CO2 meter works by using sensors to detect the amount of CO2 in the air. The device is typically placed in the grow room and left to run for a period of time. The meter will then display the CO2 levels in ppm, allowing you to adjust the CO2 levels as needed. By monitoring the CO2 levels, you can ensure that your mushrooms are receiving the optimal amount of CO2 for growth and development.


Carbon dioxide (CO2) is an essential gas for mushroom growth, but it must be maintained at the right level to achieve optimal growth and yield. Controlling CO2 levels in your mushroom grow room can be achieved through ventilation, air exchange, and the use of a CO2 controller or sensor. Using a CO2 meter for growing mushrooms can help you achieve consistent CO2 levels and optimize your mushroom farming. With the right tools and knowledge, you can grow healthy and delicious mushrooms all year round.

If you are unsure how to measure and control the CO2 levels inside your mushroom grow room, do not hesitate to contact the world-class team at Atlas Scientific.

CO2 Sensor & Scrubber

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