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Air Quality Information


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Fine particles

도봉구노원구강북구은평구성북구종로구서대문구중구동대문구중랑구마포구용산구성동구광진구강동구강서구양천구영등포구동작구서초구강남구송파구구로구금천구관악구

종로구

중구

용산구

성동구

광진구

동대문구

중랑구

성북구

강북구

도봉구

노원구

은평구

서대문구

마포구

양천구

강서구

구로구

금천구

영등포구

동작구

관악구

서초구

강남구

송파구

강동구

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the name of that gu (district) will appear.

◆ What is Ozone?

Ozone (O3) is a photochemical oxidant produced by a series of reactions between nitrogen oxide and hydrocarbons under the action of ultraviolet light (other photochemical oxidants include O3, acrolein, PAN, and Acetyl Nitrate), and is considered a secondary pollutant. It is has a distinctively pungent smell and is a strong oxidizing agent. Volatile organic compounds (VOCs), one of the ozone precursors, are emitted by automobiles, chemical processing plants, oil refineries, road markings, paints and coatings, the printing industry, and dry cleaning chemicals, and a large amount is emitted naturally by forests as well. Ozone serves to protect the Earth's ecosystem by blocking ultraviolet radiation in the stratosphere. It is created in the troposphere through photochemical reactions involving naturally produced ozone precursors.

Repeated exposure to ozone can damage the lungs, induce chest pain, and cause coughing and nausea. It can also affect the digestive system. In severe cases, it can exacerbate respiratory and heart conditions, pulmonary emphysema, and asthma. People with respiratory conditions, the elderly, and children are particularly affected by ozone, making it necessary for them to take extra care when ozone concentrations are high. Ozone can also directly affect crops and plants, as it causes the leaves to wither, reducing crop yield.

◆ Forecast Levels and Citizen Action Plan Instructions

Forecast Levels and Citizen Action Plan Instructions
Forecast LevelGoodModerateUnhealthyVery Unhealthy
Forecast Concentration (ppm)0~0.0300.031~0.0900.091~0.150Over 0.151
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.Stay indoors as much as possible.
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 should avoid outdoor activities.Limit outdoor activities. People are advised to stay indoors.

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

◆ Warning Notification Zones (5 Zones)

Alert Levels and Instructions for Citizens
ZoneNumber of DistrictsAdministrative DistrictsMap of Zones
Central3Jongno, Jung, YongsanWarning Notification Zones (5 Zones)
Northeastern8Seongdong, Gwangjin, Dongdaemun, Jungnang, Seongbuk, Gangbuk, Dobong, Nowon
Northwestern3Mapo, Seodaemun, Eunpyeong
Southwestern7Yangcheon, Gangseo, Guro, Geumcheon, Yeongdeungpo, Dongjak, Gwanak
Southeastern4Seocho, Gangnam, Songpa, Gangdong

※ Warning notifications for ozone are issued according to the zones designated above.

◆ Alert Levels and Instructions for Citizens

Alert Levels and Instructions for Citizens
LevelCriteriaInstructions for Citizens
GeneralVehicle Owners
AdvisoryHourly average is over 0.12ppm▪ Outdoor incineration is prohibited.▪ Drivers are advised to refrain from driving within the alert area (establishment of carpool system is recommended)
▪ Use of public transportation is advised▪ Use of public transportation is advised
▪ Refrain from outdoor and strenuous activities.▪ Drivers are advised to refrain from any unnecessary driving.
▪ The elderly, the infirm, children, and people with respiratory or heart conditions are advised to refrain from outdoor activities.
WarningHourly average is over 0.30ppm▪ Outdoor incineration is prohibited.▪ If possible, avoid driving within the alert area.
▪ Limit outdoor and strenuous activities
▪ Kindergartens and schools are advised to limit outdoor activities.
▪ The elderly, the infirm, children, and people with respiratory or heart conditions are advised to limit outdoor activities.
Serious WarningHourly average is over 0.50ppm▪ The operation of incineration facilities is to be suspended.▪ Driving is prohibited within the alert area.
▪ Outdoor and strenuous activities are prohibited.
▪ Kindergartens and schools are advised to suspend outdoor activities and close for the day.
▪ The elderly, the infirm, children, and people with respiratory or heart conditions are advised to refrain from outdoor activities.

[Average for Seoul]-