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Air Quality Information


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Fine particles

도봉구노원구강북구은평구성북구종로구서대문구중구동대문구중랑구마포구용산구성동구광진구강동구강서구양천구영등포구동작구서초구강남구송파구구로구금천구관악구

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◆ What are fine particles?

Fine particles (PM2.5) are created when combined with nitrogenous compounds in the atmosphere. Made up of ions such as nitrates and sulphates and toxic substances such as metallic compounds, fine particles are less than 2.5㎛ in diameter, much smaller than coarse particles, which are less than 10㎛.

When inhaled, these particles are not filtered out by the respiratory tract. They make their way deep into the lungs, where they can cause heart problems and respiratory issues.

◆ Forecast Levels and Instructions for Citizens

Forecast LevelGoodModerateUnhealthyVery Unhealthy
(Fine Particle Concentration: ㎍/㎥/day)0~1516~3536~75Over 76
Instructions for Citizens(Sensitive Groups)No need to change usual outdoor activities, but only engage in such activities after considering the status of your healthAvoid spending long periods of time outdoors or engaging in strenuous outdoor activities. People with asthma may need to use their inhaler more often.Stay indoors as much as possible. Consult your doctor before engaging in outdoor activities.
Instructions for Citizens(General)Avoid spending long periods of time outdoors or engaging in strenuous outdoor activities. In particular, anyone experiencing discomfort such as sore eyes, cough, or sore throat should avoid outdoor activities.Avoid spending long periods of time outdoors or engaging in strenuous outdoor activities. Anyone experiencing symptoms such as coughing or throat irritation must avoid outdoor activities.

(※ Sensitive Groups: Children, the elderly, the infirm, and adults suffering from asthma, other lung conditions, or heart conditions)

◆ Alert Levels and Instructions for Citizens

LevelCriteriaCitizen Action Plan Instructions
Preliminary Advisory StageConcentrations remain over an hourly average of 100㎍/㎥ for more than 2 hours at any one of the 25 air quality measurement stations▪ The elderly, infirm, children, and patients with respiratory or cardiovascular conditions should refrain from going outside.
▪ Kindergartens and elementary schools should forbid students from engaging in outdoor activities.
▪ Refrain from going to areas with heavy traffic.
▪ If you must go out, wear a protective mask.
AdvisoryConcentrations remain at a moving average of 65㎍/㎥ or higher for over 24 hours or record an hourly average of 120㎍/㎥ or higher for more than 2 hours▪ Sensitive groups (children, the elderly, the infirm, and people with respiratory or cardiovascular conditions) are advised to limit outdoor activities and stay indoors.
▪ The general public should avoid spending long periods of time outdoors or engaging in strenuous outdoor activities. When experiencing eye irritation, coughing, or sore throat, refrain from outdoor activities completely.
▪ If you must go out, wear a protective mask. Patients with lung conditions are advised to wear masks after consulting with their doctors.
▪ Refrain from going to areas with heavy traffic.
▪ Kindergartens and elementary schools should forbid students from engaging in outdoor activities.
▪ e operation of outdoor sports facilities operated by public organizations should be limited.
▪ Citizens at parks, sports facilities, subway and train stations, and bus terminals must be informed that they should refrain from strenuous outdoor activities.
WarningConcentrations remain at a moving average of 150㎍/㎥ or higher for over 24 hours or an hourly average of 250㎍/㎥ or higher for more than 2 hours▪ Sensitive groups (children, the elderly, the infirm, and people with respiratory or cardiovascular conditions) are prohibited from engaging in outdoor activities. If you must engage in an outdoor activity, consult your doctor first.
▪ The general public must avoid spending long periods of time outdoors or engaging in strenuous outdoor activities. Remain indoors if you experience coughing or a sore throat.
▪ If you must go out, wear a protective mask.
▪ possible, do not go to areas with heavy traffic.
▪ Kindergartens and elementary schools should forbid students from engaging in outdoor activities, shorten class hours, or close the school.
▪ Middle and high schools should not hold outdoor activities.
▪ The operation of outdoor sports facilities operated by public organizations must be suspended.
▪ Citizens at parks, sports facilities, subway and train stations, and bus terminals must be informed that they should not engage in strenuous outdoor activities.

[Average for Seoul]-