It started somewhere east of central London.
With reports of some sort of fog, the stench-or at least the awareness-seems to spread along the river to the east and west, near the bridge of falluur, the invitation was compared with "chlorine meets TCP/Dettol meets battery acid" and prompted Billy ginsmere of East Ham to ask: "What is this?
With reports of "burning/chemical/metal" scents spreading from the Capitol to Victoria and Paddington stations, it was compared to the great smell of London in 1858, that forced lawmakers to act on the poor health conditions in the capital.
So Wednesday is the wrong day for Qiu yuan to start bragging about its corpse flower "one of the most unpleasant smells in the plant kingdom.
By Thursday morning, the smell disappeared and the air quality recovered well, but in some cases the problem remained and there were concerns about throat pain, lung pain and headaches.
What exactly led to the Great (ish)stink of 2018?
How worried should the citizens of London be?
Will Metropolitan Police show more interest when a Twitter-focused user draws their attention to the bad smell around the capital?
To find the answer, the independent turned to Dr. Thomas Smith, assistant professor of environmental geography at the London School of Economics (LSE).
Like many others, he also noticed this strange smell.
Unlike many others, however, Dr. Smith has a "Laser Egg ".
This small device can measure air quality by measuring particles in the airand-a-
The width is half micron or less, so it is small enough to be sucked into the lungs.
Laser eggs are stationed on the roof of the St Clement building of London School of Political and Economic Science, close to Lincoln's hotel grounds, and can be read through the application on Dr. Smith's mobile phone.
When Dr. Smith noticed the odor while working in the office on the fourth floor, he checked the reading on his mobile phone.
He then went up to the roof and checked if no students were smoking near the Laser Egg, thus distorting the results.
No one has a cunning fag near the Laser Egg.
The result is true.
As Dr. Smith officially released at 9: 00.
At 48 in the afternoon, his machine gave the air quality index (AQI)
102 reading, within the scope of "unhealthy"
The current lung condition and the highest level of contamination recorded by specific equipment.
Alas, however, Dr. Smith's relatively cheap laser eggs can only calculate the particles that are in question, not what they are.
However, he can provide some speculation about where they came from.
London seems to have discovered what previous generations have said, and what some of those who leave Europe may still call the "scent of the mainland.
That's not what Dr. Smith said.
"I doubt," he said, "since the wind came from the south and south-east, it may have passed through some of the rather industrialized areas. mainland]
There may be some chemicals in Europe and in the air.
"No matter what it is," he added, "it may come from outside the UK Environment Agency's remit.
"When we consulted experts at King's College London's Air Quality Network in London, they confirmed that Dr. Smith's intuition was roughly correct.
Timothy Baker, chief air quality analyst, said London had received air doses from Austria and Germany, despite domestic --
Increased emissions, especially during peak hours at night, are part of the poor air quality on Wednesday.
Mr. Baker said: "Our monitoring equipment has found a significant increase in the type of particles formed as a result of distant air pollution reacting to us in the atmosphere. “The air [
Came to London
It took two days-Monday and Tuesday-to travel slowly in Austria and southern Germany, where a considerable portion of the urban area flowed out.
Mr. Baker said that on Wednesday, the high amount of nitrate produced from particles generated by Austrian and German cars and domestic heating was largely the cause of poor air quality in the lungs.
But as far as the Londoner's nose is so annoyed, Mr Baker is unable to identify the chemical culprit in the industry --seeming stench.
Mr. Baker explained that the cause of unhealthy air quality and the cause of bad smell are sometimes two completely different things.
The irony of air pollution, he said, is: "The side of it that causes a lot of damage to people's health is often impossible to detect.
"This problem tends to attract attention when people can see or smell something, but most people don't notice worse particle events.
Mr. Baker is willing to speculate that the Austrian and German urban areas that produce car pollution and home heating pollution may also have industrial unit emissions that will eventually stink like "chlorine meets TCP ".
But he admitted: "We don't know what caused the exact nature of the smell.
Back on the London Stock Exchange, however, Dr. Smith did provide some reassuring background-about smells and unhealthy particles.
"I don't want to be too alarmist," he said . "
Although the 102 measurement was the highest record of his laser egg, he had only had it since May.
With the exception of Wednesday, his Laser Egg recorded good air quality between 10 and 30 on the index all summer and returned to 25 on Thursday morning.
Dr. Smith said that 102 of the AQI readings had just entered the unhealthy range.
This classification indicates air quality that may adversely affect patients with asthma or other lung diseases, starting at 101.
The index reading of unhealthy for the whole population starts at 151 and is very unhealthy at 201 and "dangerous" is classified as anything above 300.
Dr. Smith said: "When studying the wildfire in Southeast Asia.
I read 2,000 in the smoke.
"Cities like Beijing often exceed 100.
For years the situation in London has been much worse than that, and whatever it is, it is over now.
He added, "people who live in more industrialized parts of the UK may have been used to the smell, but people in central London are not used to it because it is a very
"I think it might be a bit overdone.
Reactions to industrial odors may be fairly common elsewhere.