There is such a group of science students

Dealing with "smells" is their daily life

Their profession may sound a bit awkward

It's still delicious...

most of the time

Big guys like to call them "smells"

But in fact their real name is "Sniffer"

This special profession

It has been in our country for more than 20 years!

To become a sniffer

Have to undergo professional training in the laboratory

Strict written and olfactory tests

Only then can we obtain the professional qualification

It's not as "willful" as you think

It's not just "smelly"...

As professional sniffers, they need to sample the air on site at waste incineration plants, landfills, transfer stations, etc.

Vacuum glass bottles for sampling, each weighing about 20 kg, need to bring at least a dozen at a time.

This job requires high physical strength. Sometimes a maximum of 20 samples are taken a day. If the temperature is as high as 40 degrees Celsius in the hot summer season, it is really hard.

After on-site sampling, each sample also needs to be injected with clean air treated with activated carbon and divided into different dilutions for testing. The six sniffers took off the plugs on the snorkel for the three air bags distributed, compared the gas in the three air bags, and picked out the odorous air bags.

After the end of the olfactory identification, the next dilution multiple experiment is conducted. If someone answers incorrectly, the olfactory identification is terminated. When five sniffers answered wrongly, the experiment was terminated.

Maybe you will feel strange ▼

Now that technology is so developed, why is it that the embarrassing work of smelling is not handed over to the machine, but is carried out by humans? In fact, "smelly" is a subjective feeling, the machine can only objectively analyze the composition of the gas, and can not make sensory judgments on behalf of people.

Q:

Does the sniffer's nose need to be particularly sensitive?

A:

No, the sniffer needs a very ordinary nose, which is the same as the public's senses, but the sniffer must be self-disciplined, cannot smoke or drink, and can't even eat irritating food during the days of sniffer , Can't spray perfume yet.

In fact, the sensitivity of each person's nose is different, so in order to ensure fairness, each person needs 6 people to conduct the sniffer at the same time, and the judge who leads the overall situation will make the final statistical conclusion. The data obtained after statistical analysis will provide a scientific basis for urban management research.

Also, don’t underestimate the data

They have legal effect~