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Top 10 World’s Worst Smells

Our noses can distinguish over a trillion different smells. But what are the most pungent pongs?

1. THE ‘CORPSE FLOWER’ INDONESIA

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Corpse Flower

The Titan Arum plant, Amorphophallus titanum, is indigenous to rainforests in Sumatra, Indonesia. It has a humongous 3m-tall (10ft) flower that kicks up an almighty stink when it blooms. Fortunately for those living in the immediate vicinity, titan arum can go for many years without flowering. The smell of rotting flesh is due to a mixture of sulphur-containing compounds (pungent cheese), trimethylamine (rotting fish) and isovaleric acid (sweaty socks). This repugnant stench is thought to attract pollinating insects such as ‘flesh flies’ and carrion beetles.

2. THE DURIAN MALAYSIA

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Durian

Some describe the durian as the ‘king of fruits’, but many are put off by its stink, which has been likened to rotting onions, faeces and gym socks. The fruit, native to Malaysia but now common across southeast Asia, owes its smell to 44 compounds such as methanethiol (rotten cabbage) and ethanethiol (onion). Three of these had previously never been known in nature until researchers analysed the durian.

3. CENTURY EGG CHINA

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Century Egg

This unusual chinese delicacy consists of an egg preserved for several weeks or even months in a mixture of clay, ash, salt, quicklime and rice hulls. The alkaline preservatives raise the pH of the egg, breaking down many of its proteins and fats. The result is a grey-green yolk suspended in a dark brown white that reeks of ammonia and hydrogen sulphide – substances whose smell is described, unsurprisingly, as that of ‘rotten eggs’.

4. THE ZORILLA CENTRAL AND SUB-SAHARAN AFRICA

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Zorilla

Also known as the Cape polecat or African skunk, this furry fiend produces a nasty stench from its backside that can be readily detected up to half a mile away. Much like the betterknown American skunk, the zorilla has anal glands that release a blend of chemicals to defend against predators by temporarily blinding them. Sulphur-containing compounds make up a large part of these eye-watering fumes – hence the stink.

5. SEAL ISLAND SOUTH AFRICA

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Seal Island

Seal island, A tiny landmass measuring just 50x800m and lying 5.7km off the coast of South Africa, is home to over 60,000 Cape fur seals living in close proximity, and the decomposing fish and putrid faeces of their tight living quarters combine to make a colossal stench. The stink of decaying fish arises when an odourless chemical called trimethylamine oxide in the fish’s flesh is exposed to air and broken down by bacteria. This produces trimethylamine, which has a reeking, ammonia-like odour that is found in abundance on Seal Island.

6. VIEUX BOULOGNE FRANCE

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Vieux Boulogne

In 2004, scientists labelled Vieux Boulogne the smelliest cheese on the planet after a panel of judges and an ‘electronic nose’ rated the olfactory strength of 15 cheeses. This pongy fromage even beat Époisses de Bourgogne, another cheese so pungent it’s banned on local buses. The rind of the cheese is washed in beer, and the aroma comes from the beer’s bacteria reacting with the enzymes in the cheese.

7. SULPHUR CITY NEW ZEALAND

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Sulphur City

Rotorua, A city in northern New Zealand, has acquired the nickname of ‘Sulphur City’ due to its geothermal activity and subsequent aroma. Large numbers of geysers and thermal springs in the nearby countryside pump hydrogen sulphide into the air, resulting in the fragrance of rotten eggs. Since almost 70,000 people live there, though, it would seem that the residents get used to it.

8. SURSTRÖMMING SWEDEN

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Surströmming

This Swedish delicacy is made by fermenting raw herring for at least six months. The process relies on the production of lactic acid bacteria and an enzyme in the spine of the fish to convert sugars into acids and alcohols. Species of the bacteria Haloanaerobium help ripen the fish, giving it a sour taste, but also cause the production of hydrogen sulphide and butyric acid.

9. THE FATBERG UK

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The Fatberg

In 2013, Sewer workers removed a 15-tonne ball of fat lodged in London’s pipes. “It’s a heaving, sicksmelling, rotting mass of filth and faeces. It’s gross,” said a Thames Water spokesperson. The fatberg, a bus-sized toxic mix of congealed fat, oil, nappies and faeces, took three weeks to clear.

10. THE STINKBIRD SOUTH AMERICA

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The Stinkbird Hoatzin

Also known as Opisthocomus hoazin, this bird from the Amazon Delta is so stinky it is only hunted by humans in dire need. The stinkbird owes its manure-like stench to an aromatic diet of leaves and its unique digestive system, which uses bacterial fermentation to break down food. Its food fermentation chamber is so enlarged to accommodate decomposing plants and stinky gases that its flight muscles and sternum are reduced, making it a weak and clumsy flyer. (Source : BBC Focus Science and Technology)

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