Air Pollution Facts - What You Should Know
The main purpose of this page is to provide you with critical air pollution facts so that you can keep up to date with the latest research on where severe air pollution events most commonly occur around the world.
If you're planning to travel overseas, you need to be aware that most severe air pollution episodes are seasonal and so can be avoided. However, if you're planning to travel to Dhaka, which is the capital of Bangladesh, you can expect air pollution levels to be dangerously high throughout the whole year.
Many locations in the world have high smog levels, even those promoted as having clean air.
Here's some alarming air pollution facts about:
Air pollution facts for Europe
The worst location in Europe for air pollution is located where the borders of Poland, Czech Republic and Germany meet.
This area is known as the "The Black Triangle" since this region is one of the most industrialised regions in all of Europe.
This region has considerable amounts of both acidic fog and rain events, that have severely damaged the forests.
You should definitely keep away from the Black Triangle if you suffer from any respiratory illness, since your symptoms will be exasperated if you stay here for even a short period of time.
Air pollution facts for China
This may not come as any surprise to you. Acid rain affects 38% of the Chinese cities. The main cities where acid rain occurs is Beijing, Shanghai as well as Guangzhou, Shanzhen and Hong Kong.
The Chinese people rely heavily on coal as their main source of energy consumption. When this coal is burned, PAH's as well as sulfur dioxide (SO2) are produced. This SO2 converts to sulfate (SO4) when oxidised. The SO4 is highly soluble, and that explains why it's the main cause of acid rain in China.
Acid rain is a major concern in China, particularly in the southern and eastern parts. The reason why acid rain isn't as bad over the northern parts of China is because the high proportion of carbonates (CO3) in the dust clouds act to neutralise the SO2 emissions in the area.
Air pollution facts for Beijing
Beijing is the capital of China and also China's second largest city. It had a population based on Dec 2007 estimates, of 17.4 million but as of January 2016, it has reached 21.5 million. Beijing has many air pollution problems due to the huge amount of traffic emissions coming from airports, railways, and vehicles. Dust storms frequently pass over Beijing during the spring (March, April and May) and havebeen getting worse since 1999. This dust mixes with the local air pollution, not only causing low visibility, but also causing severe respiratory problems in the general population.
Air pollution facts for Japan
The western coastline of Japan is subject to high levels of air pollutants that have arrived from the industrial parts of mainland China.
These types of pollutants are only common when the wind is blowing in from China. However, Japan does produce significant levels of home grown air pollutants in Tokyo, Sappora, Osaka and Kobe.
A number of studies have shown that the concentration of vehicle pollutants in the atmosphere over Japan is seasonal. Winter has the highest levels of vehicle pollutants and summer records the lowest levels of these types of pollutants. It's not that people drive less in summer. What happens is the sunlight converts the vehicle emissions to secondary air pollutants such as ozone and so the measured levels of primary vehicle pollutants are lower during the summer.
From the point of view of human health, vehicle emissions are quite dangerous when the concentrations are high. These types of pollutants produce polycyclic aromatic hydrocarbons (PAH's). PAH is a potent air pollutant and is classified as a possible carcinogen.
With that in mind, you should be aware Tokyo, Sappora, Osaka and Kobe all emit PAH's to varying degrees. However, PAH's are not only produced by vehicle emissions. They form due to the incomplete combustion of fossil fuels from burning coal, wood, as well as steel and iron industries. Okay, now that you know this, the worst region in Japan for PAH's is the industrial city of Fuji.
Highly industrial regions in Japan, like Fuji also act as sources of SO2, which lead to acidic precipitation. I should also point out that vehicle emissions, such as NOx also can produce acidic precipitation.
Please note: I have written another page about air pollution facts in Japan so hopefully this will help answer your questions.
Electric cars produce far less CO and hydrocarbons compared with conventional vehicles but other forms of air pollutants such as NOx and CO2 are emitted at the same rate.
Dust and air pollution facts
In recent decades, there has been an increased number of air pollutants being emitted to the atmosphere through both natural processes (i.e. dust storms, bush fires and volcanic ash) as well as from industrial and vehicle sources. Did you know that burning emissions from coal and vehicle exhausts have increased by about 4% per year since the 1970s in Asia? Did you also realise that these air pollutants are regularly transported thousands of kilometres downwind and this impacts the ecosystems and human health in the countries where it's deposited?
Here's some air pollution facts that may be interesting for you. The main natural air pollutant is mineral dust, which is commonly found in the arid regions of the world. This so-called benign dust can quickly be transformed into a massive dust cloud when the surface weather conditions are windy.
These dust storms cause airport closures in many countries across the Middle East and Asia. However, while this is extremely annoying if you're left waiting at the airport, there's a darker side to these dust storms.
A number of scientific studies have shown that dust storms are able to transport live fungus, mold, bacteria, viruses and even live locusts ten's of thousands of kilometres across oceans. Dust analysed from the Sahara desert shows that it carries with it specific bacteria that is dangerous to human health. If these dust particles are inhaled, you inevitably also inhale some of the bacteria.
There's some scientific evidence to suggest that meningitis outbreaks in North Africa are linked to the frequent occurrence of dust storms in that region.
Air pollution facts regarding the worst smog event the world has ever known
One of the worst severe air pollution events in the world wasn't caused by human activities. Instead, it occurred due to a volcanic eruption in Iceland, known as the Laki eruption. This volcano erupted on the 8th June 1783 and continued until 7th February 1784. It emitted 122 megatons of foul smelling acidic fog. This thick fog mostly consisted of sulfur dioxide (SO2).
What you may find amazing about this particular fog is that it had the same acidity as stomach acid (pH ~ 1 - 2). This thick sulphurous fog covered large areas, stretching from the United Kingdom (UK) to the Middle East as well as from Scandinavia to Portugal. It's no wonder that most plant life died and so many farmers were forced to abandon their livelihood and hope that they wouldn't starve to death.
This air pollution was so severe that one quarter of Iceland's population perished and thousands of animals and people died elsewhere. Furthermore, many people died, not only because the air quality was so bad, but due to the lack of fresh food and clean drinking water.
What compounded the situation was the fact that the volcanic emissions produced extreme weather conditions. Generally, the winters and summers were much colder than usual in some areas. In particular, Alaska didn't receive any warmth during the summer of 1783 and much of the ground remained frozen and thus crops could not be grown. In contrast, parts of Europe were in the grip of severe heat waves throughout this time.
Seven air pollution facts that most people do not know:
Ozone air pollution facts
High concentrations of surface ozone are common in most large cities throughout world, particularly on warm sunny days. Typically, surface ozone forms when traffic exhaust pollutants such as nitrogen oxides (NOx) and volatile organic compounds (VOC's) react with sunlight.
This ozone is known to aggravate pre-existing respiratory illnesses such as asthma and bronchitis.
Severe ozone pollution episodes in Athens and Los Angeles are common in the summer months. Both these cities are surrounded by an ocean on one side and tall mountains on the other. When a sea breeze is advancing inland, it pushes all the ozone with it where it becomes trapped near the base of the impenetrable mountains.
If you happen to be living in this particular area, then it's highly likely you'll be suffering some form of eye and throat discomfort. At night, surface ozone levels drop since there's no sunlight and also due to the fact that the land breeze blows much of the smog back towards the coastal areas.
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