Air quality in Asan

Air quality index (AQI) and PM2.5 air pollution in Asan

Last update at (local time)

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What is the current weather in Asan?

Weather icon
WeatherClear sky
Wind5.7 mp/h
Pressure1013 mb

live aqi city ranking

Real-time South Korea city ranking

#cityUS AQI
1 Osan, Gyeonggi-do


2 Yeongi, Chungcheongnam-do


3 Hwaseong, Gyeonggi-do


4 Paju, Gyeonggi-do


5 Gunpo, Gyeonggi-do


6 Cheonan, Chungcheongnam-do


7 Pubal, Gyeonggi-do


8 Taean, Chungcheongnam-do


9 Seosan, Chungcheongnam-do


10 Asan, Chungcheongnam-do


(local time)


live Asan aqi ranking

Real-time Asan air quality ranking

#stationUS AQI
1 Asan City Hall


2 Dokgingi Campground


3 Yi Sunshin Sports Complex


4 Baebang-eup


5 Oeam Folk Village


6 Dunpo-myeon


7 Bongjae 1-ri Village Hall


8 Dongsan 2nd Ward Senior Citizenship


9 Jisan Park


10 Dogo-myeon


(local time)




live AQI index
Unhealthy for Sensitive Groups

Human face indicating AQI level


What is the current air quality in Asan?

Air pollution levelAir quality indexMain pollutant
Unhealthy for Sensitive Groups 120 US AQItrendPM2.5



PM2.5 concentration in Asan is currently 8.6 times the WHO annual air quality guideline value

Health Recommendations

How to protect from air pollution in Asan?

An IQAir mask icon Sensitive groups should wear a mask outdoors
Get a Mask
An IQAir purifier icon Run an air purifier
Get an air purifier
An open window iconClose your windows to avoid dirty outdoor air
A man cycling iconEveryone should reduce outdoor exercise


Asan air quality index (AQI) forecast

DayPollution levelWeatherTemperatureWind
Monday, Sep 26

Moderate 83 US AQI

Human face indicating AQI level
Weather icon75.2°57.2°
Wind rotating 339 degree

4.5 mp/h

Tuesday, Sep 27

Unhealthy for Sensitive Groups 117 US AQI

Human face indicating AQI level
Weather icon77°55.4°
Wind rotating 69 degree

2.2 mp/h

Wednesday, Sep 28

Unhealthy for Sensitive Groups 136 US AQI

Human face indicating AQI level
Weather icon75.2°57.2°
Wind rotating 128 degree

2.2 mp/h


Unhealthy for Sensitive Groups 120 US AQI

Human face indicating AQI level
Weather icon75.2°55.4°
Wind rotating 321 degree

4.5 mp/h

Friday, Sep 30

Moderate 100 US AQI

Human face indicating AQI level
Weather icon77°55.4°
Wind rotating 329 degree

2.2 mp/h

Saturday, Oct 1

Unhealthy for Sensitive Groups 105 US AQI

Human face indicating AQI level
Weather icon75.2°57.2°
Wind rotating 355 degree

2.2 mp/h

Sunday, Oct 2

Unhealthy for Sensitive Groups 108 US AQI

Human face indicating AQI level
Weather icon68°60.8°
Wind rotating 114 degree

4.5 mp/h

Monday, Oct 3

Moderate 66 US AQI

Human face indicating AQI level
Weather icon75.2°62.6°
Wind rotating 212 degree

11.2 mp/h

Tuesday, Oct 4

Moderate 53 US AQI

Human face indicating AQI level
Weather icon71.6°53.6°
Wind rotating 210 degree

17.9 mp/h

Wednesday, Oct 5

Good 30 US AQI

Human face indicating AQI level
Weather icon64.4°50°
Wind rotating 4 degree

4.5 mp/h

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Historic air quality graph for Asan

How to best protect from air pollution?

Reduce your air pollution exposure in Asan


What is the current level of air pollution in Asan?

Asan is a city in South Chungcheong Province, South Korea. It is adjacent to the Seoul metropolitan area on its northern boundary. According to a 2013 census, Asan had a population of approximately 308,000 people. Although this cannot be looked upon as being accurate as it has merged with the adjoining town of Onyang-dong. It is primarily known for the proliferation of hot springs and spas nearby. Two of South Korea’s behemoth companies have factories in Asan, namely Hyundai and Samsung. There is a total of 14 industrial complexes within the area and the Port of Pyeongtaek is close by which is the nearest port to the east coast of China.

Towards the middle of 2021, Asan was experiencing a period of air quality that was classified as being “Unhealthy for sensitive groups” with a US AQI figure of 111. This placed it as the 8th dirtiest city in South Korea at that time. This United States Air Quality Index number is an internationally used set of metrics supported by the World Health Organisation (WHO) and is used to compare air quality in different cities throughout the world using comparable standards. It is calculated by using the levels of the six most commonly found pollutants. If not all figures are available, the figure is calculated using what information is there. In the case of Asan, only PM2.5 was recorded which was 39.4 µg/m³. This figure is quoted in micrograms/microns per cubic metre. At almost 40 µg/m³, the level is almost 4 times higher than the permitted level as suggested by the World Health Organisation (WHO).

With a level as poor as this, the advice is to stay indoors as much as possible and to close doors and windows to prevent the ingress of more polluted air. Those of a sensitive disposition should avoid venturing outside until the quality improves. Outdoor exercise is not recommended for anyone at this level and the use of an air purifier would be very beneficial if one is available.

Does this level of pollution remain constant in Asan?

Looking back at the figures released by the Swiss air monitoring company, for 2020, for 11 months of the year, Asan enjoyed “Moderate” air quality with figures between 12.1 and 35.4 µg/m³. The only month when the quality was not as good was during January when the figures put it into the “Unhealthy for sensitive groups” classification with a 37.6 µg/m³ reading.

Records were first kept in 2017 when the level was recorded as being 26.8 µg/m³. The following year showed a slight improvement with a 26 µg/m³ figure. Unfortunately, in 2019 it slipped down to 31 µg/m³ before showing signs of improvement in 2020 with a 25.1 µg/m³ reading. However, this may not be a truly accurate reflection of reality because of the restrictions imposed due to the COVID-19 pandemic. Many vehicles were no longer used as the drivers were furloughed and not required to commute to and from work. There were also many factories and other non-essential production units which were temporarily closed in an attempt to prevent the spread of the virus.

What are the main sources of this pollution in Asan?

Since the Industrial Revolution, humans have used a lot of fossil fuels and achieved material abundance through industrialisation, but the extensive use of fossil fuels has caused various environmental problems. Environmental problems arising from the use of fossil fuels include air pollution, acid rain, environmental damage caused by oil spill accidents and global warming.

Burning fossil fuels produces harmful pollutants such as carbon monoxide, nitrogen oxides, sulphur oxides, and hydrocarbons, which pollute the air and harm our health. Dust in the air, including fine dust, also causes air pollution, and nitrogen oxides and hydrocarbons combine due to the sunlight in the air to cause smog. Carbon monoxide, a major source of emissions from automobiles, is a gas produced when fossil fuels are not fully burned, causing headaches and additional stress for people with heart disease.

What can be done to improve the air quality in Asan?

Spring has also started this year with a fine dust advisory warning. Fine dust is air pollution that occurs all year round. However, in March-May, when air stagnation is frequent, air pollutants are often trapped without circulation, and as the monsoon changes to the southwest wind, external pollution from inland China is added, causing the most severe damage of the year. In addition, as yellow dust, a representative air pollution phenomenon on the Korean Peninsula caused by external influences, accompanies the spring season, awareness of fine dust air pollution damage in Korean society is heightened even more.

Due to the fact that the cause of fine dust is influenced by foreign sources/pollution sources as well as domestic factors, our society is holding China responsible for having a large-scale pollution source for a long time. This public sentiment was also reflected in the common diplomatic pledge of all presidential candidates to cooperate with China to solve the fine dust problem during the 19th presidential election in 2017.

How does this poor air in Asan affect human health?

Nitrogen dioxide (NO2), which is released when fuel is burned in automobiles and thermal power plants, is the main culprit of air pollution, and a study has found that nitrogen dioxide is associated with the development of Parkinson's disease, a degenerative brain disease. This is the first study in Korea to prove the correlation between nitrogen dioxide, an air pollutant, and Parkinson's disease, based on a large population, at a time when theories have been raised that air pollution, which has been raised as a social problem, can cause brain diseases.

Microscopic pollutants in the air can slip past our body’s defences, penetrating deep into our respiratory and circulatory system, damaging our lungs, heart and brain.

The brain starts developing weeks after conception, and like the rest of the body, continues to change throughout the rest of life, facing the threat of many environmental hazards — whether old, new, unknown or unregulated. For instance, the effects of lead and mercury on the brain have been known for decades and still present a large global health problem. Many pesticides are neurotoxic, and yet remain available for use. Recent evidence suggests that fluoride, a compound used in public water supplies to reduce tooth decay, may also be neurotoxic.


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