Coffee can pick up odor from its surroundings

Roasted coffee beans contain an extremely rich system of volatile compounds. These compounds are responsible for most of the aroma a drinker perceives, but they also make coffee a product that needs protection from strong odor sources during storage.

Dry spices like cinnamon, star anise, cloves, pepper, or spice blends can contain many volatile aromatic compounds. When placed near coffee in an enclosed space, those aroma compounds can end up in the air or in the storage material. How much impact this has depends on exposure time, temperature, how sealed the packaging is, and each product's own characteristics.

This doesn't mean coffee placed near a jar of spices will immediately pick up a spice smell. A well-sealed bag with a good barrier significantly reduces exchange with the environment. But “reduced” isn't the same as “impossible,” especially once the packaging has been opened or wasn't designed for long-term protection.

So keeping coffee away from strong odor sources is a simple, low-cost preventive measure that doesn't need to wait until the product has already picked up an odd smell.

Not just spices: many other warehouse odor sources are worth noting

Spices are just one example. In a storage area, coffee can also come into contact with odors from cleaning products, chemicals, paint, rubber, fresh wood, strongly scented food, or other goods stored in the same space.

One easy thing to overlook is that odor can linger in a storage area even after the source has been removed. If a warehouse previously stored chemicals or strongly scented products, the surrounding surfaces and materials can continue releasing odor.

For coffee, the concern isn't only whether that odor is “toxic.” A foreign smell can also change the sensory experience and keep the product from showing its true characteristics.

So warehouse management should treat odor sources as an environmental factor to control, alongside temperature, humidity, and light. A warehouse that's free of dust but carries a strong smell still isn't an ideal environment for coffee.

Good packaging reduces risk but doesn't replace warehouse layout

Packaging's gas-barrier ability is an important layer of protection. But the level of protection depends on the material structure, the seal, how well-sealed it stays, and storage duration. Once a bag is opened, its ability to isolate the product from the environment changes significantly.

Research on coffee and packaging shows different barrier structures create different storage conditions. That means not every type of bag should be treated as an identical “shield” against environmental odor.

So layout within the warehouse still matters. Coffee should be kept away from strong odor sources, away from areas with chemicals or strongly scented foods. For opened coffee, using a suitable sealed container or bag becomes even more important.

Preventing exposure in the first place is usually much simpler than tracking down the cause after a batch of coffee has already developed an unusual smell.

Separating odor sources is a simple storage principle

A coffee warehouse doesn't necessarily need complex equipment to control odor. The first step can simply be listing the materials and products being stored, identifying strong odor sources, and giving them their own designated area.

If cleaning products or chemicals are used, they should have a separate storage area and not be placed together with raw material or finished products. If the warehouse stores various food items, strongly scented products should also be zoned separately.

When coffee develops an unusual smell, the investigation should start with its storage history: was the packaging ever opened, what odor sources was it near, did anything change in the warehouse, and do other batches show the same issue?

One very simple principle can go a long way toward protecting quality: coffee should be kept in an environment where the most noticeable smell is still the smell of the coffee itself.

References

• FAO — Good Hygiene Practices in the Coffee Chain / coffee quality and storage guidance — https://www.fao.org/3/y0600e/y0600e00.htm
• Volatile compounds indicating latent damage to sensory attributes in coffee stored in permeable and hermetic packaging (2021) — https://www.sciencedirect.com/science/article/pii/S2214289421000739