The Hidden Science Behind Storing Potatoes: What Does CO₂ Gas Have to Do With It?

Asish Sahoo
May 15, 2025

✅ TL;DR – Why CO₂ and Temperature Control Matter in Potato Storage

CO₂, humidity, and temperature management are critical for preserving potatoes in cold storage. IoT monitoring systems optimize conditions to:

🌡️ Maintain the ideal temperature and humidity for longer shelf life
💨 Control CO₂ levels to prevent spoilage and sprouting
📱 Provide real-time monitoring and automated alerts for conditions outside optimal ranges
✅ Reduce waste and improve overall storage efficiency

Ensure potato quality and freshness with IoT-driven storage management for optimal CO₂ and temperature control.

Overview

Have you ever wondered how potatoes stay fresh for months in cold storage without spoiling? It might surprise you, but the secret lies not just in cold temperatures — CO₂ gas, humidity, and temperature control all play big roles in keeping potatoes in perfect condition.

In this blog, we’ll break it down in simple terms, but also include just the right amount of technical detail so you understand what’s really happening inside those giant cold storages.

Why Do We Store Potatoes in Cold Storage?

After harvesting, potatoes are still alive and need to be stored carefully. Without proper storage, they will:

Start sprouting
Rot due to bacteria or fungus
Shrink due to water loss leading to loss of weight impacting business

To prevent this, they are stored in cold storages — large rooms or warehouses with tightly controlled temperature, humidity, and air quality.

The Role of Air and Gases Inside Cold Storage

Now here’s where it gets interesting…

Even after being harvested, potatoes are still alive. They continue to “breathe” — not like humans, but through a process called respiration. In this process, potatoes take in oxygen (O₂) and release carbon dioxide (CO₂).

Simple version of potato respiration:


Glucose (from the potato) + Oxygen → Carbon Dioxide + Water + Energy

Over time, CO₂ gas starts building up in the storage room — just like how a room can get stuffy if it’s closed for too long.

How Do Cold Storages Manage CO₂?

There are several ways storage operators control the gas levels:

Ventilation Fans
- These bring in fresh air from outside and remove CO₂-rich air.
CO₂ Monitors and Sensors
- Devices that continuously check the air quality and show CO₂ levels.
CO₂ Scrubbers
- These are special machines or filters (often made with lime or activated carbon) that trap and remove CO₂ from the air.
Timed Air Changes
- Some systems automatically change the air inside the storage every few hours.

A Simple Analogy

Imagine cold storage like a cozy bedroom for potatoes:

Temperature is the AC, keeping them relaxed.
Humidity is a humidifier, keeping their skin soft and hydrated.
Ventilation is the window, making sure the air stays fresh and doesn’t get stuffy with too much CO₂.

If any one of these isn’t managed properly, your potatoes are going to feel the stress — and it’ll show in their quality, which will impact business and revenue.

Summary: Ideal Conditions for Potato Storage

Parameter	Ideal Range	Why It Matters
Temperature	4°C – 10°C	Slows sprouting and microbial activity
Humidity	90% – 95%	Prevents shrinkage and keeps potatoes firm
CO₂ Level	Less than 1–2%	Reduces sprouting but avoids internal damage
Oxygen Level	Around 20% (normal air)	Needed for safe potato respiration

Final Takeaways

Potatoes need more than just cold to stay fresh — they need the right mix of temperature, humidity, and air quality.
CO₂ is produced naturally by potatoes during storage. If not managed, it can cause spoilage.
Well-managed cold storages use coolers, humidifiers, air monitors, and sensors to keep everything in balance.

Conclusion:

Storing potatoes is part science, part care. Cold storages are not just “fridges” — they’re controlled environments that work round-the-clock to maintain the right balance of temperature, humidity, and air gases like CO₂. The better these are controlled, the fresher your potatoes stay.

So next time you enjoy crispy fries or a hot potato curry, remember — there’s a bit of hidden science behind every bite!