The Invisible Step Behind Your Everyday Staples

Understanding Fumigation in the Food System and Why It Matters

We all know the feeling.

You open a fresh pack of chips and it is half air. We have all been there.

But here is something you probably did not know. That “air” is actually an inert gas like nitrogen. It is colourless, odourless, and intentionally added. It helps keep the chips fresh, prevents oxidation, and protects them from getting crushed during transport. Completely fine.

This article is not about that gas.

This article is about the other kind. The kind that gets used on your rice, your wheat, your maize, your spices, and your dal before it ever reaches the shelf. The kind that is not on the label. The kind that nobody talks about. The kind that is genuinely toxic.

What is Fumigation in Food Storage, and Why Is It Used?

Fumigation is the process of filling a sealed space with toxic gas to kill insects and pests. It is used during warehouse storage and cargo transport. This means it happens after the food is harvested and before it reaches you.

It is an industry standard practice. Almost every major grain company and spice exporter uses it. Rice, wheat, maize, pulses, and spices, including the staples that billions of Indians eat every single day, can go through this process at some point in the supply chain.

Fumigation is a term 9 out of 10 people have never heard, even though it is practiced on 9 out of 10 staple products they buy. It is not disclosed. It is not labeled. It is simply done, and the consumer is left with no idea.

Countries have already started restricting some of these chemicals. The EU has banned ethylene oxide for food fumigation and completely phased out methyl bromide. The USA is tightening ethylene oxide exposure limits significantly over the coming years.

India, however, continues to permit the use of major fumigation chemicals with minimal consumer-facing regulation and no mandatory labelling.

Fumigation is applied directly inside grain storage bins, warehouse stacks, shipping containers and ship holds. Tablets are placed into the grain mass itself. The gas saturates every corner of the grain for 5 to 14 days before the product is ventilated and sent to market.

And yes, ventilation reduces some of the gas, but not all of it.

Fumigation Chemicals Used in Food: What You Should Know

These are not mystery compounds buried in a research paper. They have names. And those names should matter to anyone who eats food.

Aluminium Phosphide (AlP) in Rice and other Grains

Aluminium Phosphide is the most widely used grain fumigant in the world. When AlP tablets come into contact with moisture, they release phosphine gas. That gas permeates the entire grain mass and kills insects at the cellular level by blocking oxygen utilization in their mitochondria.

Here is the problem. The same mechanism works in human cells.

The WHO classifies phosphine as Class Ia, which is Extremely Hazardous, the highest category. In India alone, aluminium phosphide causes approximately 15,000 poisoning cases every year with a mortality rate of 67 percent. There is no specific antidote.

But what about the residue?

The industry likes to say the grain is residue-free after aeration. Research disagrees. A 2023 study using gas chromatography found that more than 85 percent of absorbed phosphine converts to non-volatile compounds. This means they chemically bond to the grain and cannot be removed by ventilation. These compounds travel through milling, cooking, and into your body.

The Codex MRL for phosphine in raw cereals only measures free phosphine gas. It does not measure the non-volatile compounds that stay bound to the grain. So a grain can pass safety tests and still carry residues.

Methyl Bromide in Exported Food

Methyl Bromide is a colourless, odourless gas that was phased out under the Montreal Protocol due to its impact on the ozone layer and banned in the EU.

Yet it is still used under something called the Quarantine and Pre-Shipment exemption.

This means grain being exported can still be fumigated with it. Food grown in India or elsewhere can legally be treated with this chemical before it reaches global markets.

Studies have shown that exposure is linked to neurological damage, unstable gait, and long-term organ impact. It also interacts with DNA, raising concerns about mutagenic effects.

Ethylene Oxide in Spices and Herbs

Ethylene Oxide is commonly used on spices, sesame seeds and dried herbs to control microbial contamination. It is classified by the International Agency for Research on Cancer as a Group 1 carcinogen. This means it is confirmed to cause cancer in humans.

The EU has banned its use in food completely. Multiple safety alerts have been issued globally for spice shipments exceeding safe limits.

India still permits its use. And it does not appear on labels.

Sulfuryl Fluoride Residues in Food

Often marketed as a safer alternative, Sulfuryl Fluoride breaks down into inorganic fluoride when it comes into contact with food.

This fluoride gets absorbed into the grain and cannot be removed.

Regulatory bodies have identified the brain as the primary target organ. Studies have linked exposure to brain tissue damage, fluorosis, thyroid dysfunction, and developmental concerns in children.

Hydrogen Cyanide in Grain Storage

Hydrogen Cyanide is one of the oldest fumigants still in use. It works by blocking the body’s ability to use oxygen at a cellular level, leading to cellular asphyxiation.

Cereal grains absorb it during fumigation. Cleaning and milling reduce residues, but they do not eliminate them completely.

Why Fumigation Is Not Mentioned on Food Labels

Here is what is genuinely baffling.

Food irradiation must be declared on packaging in many countries. Allergens must be declared. Preservatives must be declared. But fumigation chemicals are completely exempt from disclosure in India.

FSSAI requires a nutrition table, ingredient list and allergen information. It does not require any disclosure of post-harvest chemical treatments, including fumigation.

No rule. No mandate. No requirement.

Companies are not hiding it in fine print. They are not required to mention it at all. The consumer is not even given the choice to know.

If fumigated food had honest labeling, it would read something very different. It would clearly state that the product has been treated with chemicals like Aluminium Phosphide or Ethylene Oxide during storage or transport, and that residues may be present.

That is not happening anywhere in India.

Does Organic Food Undergo Fumigation?

Consider this situation.

You buy rice that says organic on the pack. You pay a premium. Organic certification covers farming practices. It does not automatically cover post-harvest fumigation during storage or shipping.

You may have just paid extra for organic rice that went through phosphine gas treatment. And nobody is required to tell you.

Chemical-Free Alternative to Fumigation: Vacuum Packaging

The argument companies make is simple. Grain needs protection from pests during storage and transport.

That part is true.

But fumigation is not the only solution. It is just the cheapest one.

Vacuum packaging removes oxygen from the sealed environment. Without oxygen, insects cannot survive. Eggs cannot hatch. Microbial growth slows down significantly.

The grain is preserved naturally. No chemical intervention. No residues.

And here is something most people misunderstand.

Grains grown without chemicals will naturally attract small insects. That is not a flaw. That is a sign the food is real. Insects go where food is alive. They do not go after highly processed or synthetic grain.

These insects can be removed before cooking. They are far less harmful than the chemicals used to eliminate them.

Vacuum packaging does cost more. The equipment is a one-time investment, and the packaging materials are more expensive.

But the real question is not cost. The question is what the consumer deserves.

Vacuum packaging can deliver extended shelf life with zero chemicals, zero residues, and no compromise on organic integrity. It also allows brands to be transparent about how their food is handled.

What Rajamudi Does Differently

At Rajamudi Organics, one decision was made early and it has not changed.

We do not fumigate our products with any chemical gas. Not phosphine. Not methyl bromide. Not ethylene oxide. Not sulfuryl fluoride. Not hydrogen cyanide.

Every product is vacuum packed at our own FSSAI-licensed processing facility in Karnataka.

Every export batch is tested for heavy metals including lead, arsenic, cadmium and mercury using ICP-MS testing.

We hold multiple international organic certifications including NPOP, USDA NOP, EU Organic and others.

This approach costs more. There is no denying that.

But organic should mean organic from start to finish. Not just at the farm level, but through storage, transport, and packaging.

If food is truly clean, there should be nothing to hide.

If no one is telling you what happens to your food after harvest, you should start asking why.