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Air Quality Information


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◆ Forecast Standards

CategoryFine particles(PM-2.5)Coarse Particles(PM-10)Ozone(O₃)Nitrogen Dioxide(NO₂)Carbon Monoxide(CO)Sulfur Dioxide(SO₂)Comprehensive Air Quality Index
Good0~150~300~0.0300~0.0300~2.000~0.0200~50
Moderate16~3531~800.031~0.0900.031~0.0602.01~9.000.021~0.05051~100
Unhealthy36~7581~1500.091~0.1500.061~0.2009.01~15.000.051~0.150101~250
Very Unhealthy76~151~0.151~0.201~15.01~0.151~251~
Being Evaluated

◆ Alert Standards

Air PollutantWarning LevelAlert CriteriaCancellation Criteria
OzoneAdvisoryHourly average of 0.12ppm or higherHourly average below 0.12ppm
WarningHourly average of 0.30ppm or higherHourly average below 0.30ppm
→ Change alert level to advisory
Serious WarningHourly average of 0.50ppm or higherHourly average below 0.50ppm
→ Change alert level to warning
Coarse ParticlesAdvisoryHourly average of 150㎍/㎥ or higher for 2 hours or moreHourly average below 100㎍/㎥
WarningHourly average of 300㎍/㎥ or higher for 2 hours or moreHourly average below 150㎍/㎥
→ Change alert level to advisory
Fine particlesAdvisoryHourly average of 90㎍/㎥ or higher for 2 hours or moreHourly average below 50㎍/㎥
WarningHourly average of 180㎍/㎥ or higher for 2 hours or moreHourly average below 90㎍/㎥
→ Change alert level to advisory

◆ Measured Amount of Air Pollutants

CategoryStationCoarse Particles(㎍/㎥)Fine particles(㎍/㎥)Ozone(ppm)Nitrogen Dioxide(ppm)Carbon Monoxide(ppm)Sulfur Dioxide(ppm)Comprehensive Air Quality Index
1Hour1Hour1Hour1Hour1Hour1HourLevelIndexDeterminant Pollutant
City Air Quality Average for Seoul 4 2 0.01 0.006 0.252 0.003 - 18.375 -
Jongno-gu 4 2 0.009 0.006 0.2 0.003 Good 16 O3
Jung-gu 4 2 0.009 0.007 0.2 0.002 Good 16 O3
Yongsan-gu 3 1 0.008 0.006 0.2 0.002 Good 14 O3
Seongdong-gu 5 1 0.009 0.005 0.2 0.003 Good 16 O3
Gwangjin-gu Being Evaluated 9 0.008 0.006 0.5 0.004 - Being Evaluated Being Evaluated
Dongdaemun-gu 3 1 0.008 0.007 0.2 0.004 Good 14 O3
Jungnang-gu 3 1 0.008 0.007 0.2 0.005 Good 14 O3
Seongbuk-gu 9 1 0.009 0.007 0.5 0.003 Good 16 O3
Gangbuk-gu 5 1 0.010 0.004 0.2 0.002 Good 17 O3
Dobong-gu 3 1 0.009 0.003 0.3 0.003 Good 16 O3
Nowon-gu 5 2 0.007 0.005 0.2 0.003 Good 12 O3
Eunpyung-gu 5 7 0.010 0.004 0.1 0.004 Good 26 PM25
Seodaemun-gu 3 1 0.009 0.002 0.5 0.002 Good 16 O3
Mapo-gu 3 2 0.001 0.003 0.5 0.003 Good 13 PM25
Yangcheon-gu 5 2 0.007 0.006 0.2 0.003 Good 16 PM10
Gangseo-gu 3 2 0.009 0.005 0.3 0.004 Good 16 O3
Guro-gu 3 1 0.021 0.006 0.2 0.004 Good 36 O3
Geumcheon-gu 4 3 0.008 0.005 0.2 0.003 Good 14 O3
Yeongdeungpo-gu 4 3 0.008 0.010 0.3 0.002 Good 17 NO2
Dongjak-gu 7 3 0.009 0.006 0.2 0.002 Good 16 PM10
Gwanak-gu 6 1 0.042 0.008 0.1 0.003 Moderate 61 O3
Seocho-gu 3 5 0.010 0.006 0.2 0.004 Good 17 O3
Gangnam-gu 6 1 0.008 0.005 0.2 0.004 Good 14 PM10
Songpa-gu 3 1 0.010 0.005 0.2 0.002 Good 17 O3
Gangdong-gu 6 2 0.006 0.006 0.2 0.003 Good 11 PM10