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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
Good0~150~300~0.0300~0.0300~0.2000~0.0200~50
Moderate16~5031~800.031~0.0900.031~0.0602.01~9.000.021~0.05051~100
Unhealthy51~10081~1500.091~0.1500.061~0.2009.01~15.000.051~0.150101~250
Very Unhealthy101~151~0.151~0.201~15.01~0.151~251~
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 50 24 0.012 0.04 0.667 0.005 - 71.087 -
Jongno-gu 51 25 0.010 0.048 0.9 0.004 Moderate 80 NO2
Jung-gu 50 28 0.008 0.051 0.8 0.004 Moderate 85 NO2
Yongsan-gu 40 23 0.013 0.039 0.6 0.003 Moderate 65 NO2
Seongdong-gu 43 22 0.006 0.037 0.5 0.005 Moderate 62 NO2
Gwangjin-gu 59 35 0.008 0.031 0.6 0.006 Moderate 65 PM10
Dongdaemun-gu 46 26 0.014 0.057 0.8 0.009 Moderate 95 NO2
Jungnang-gu 38 15 0.013 0.032 0.6 0.006 Moderate 53 NO2
Seongbuk-gu 51 22 0.009 0.045 0.9 0.003 Moderate 75 NO2
Gangbuk-gu 41 22 0.012 0.040 0.6 0.003 Moderate 67 NO2
Dobong-gu 53 32 0.013 0.031 1.0 0.005 Moderate 61 PM10
Nowon-gu 42 16 0.021 0.031 0.6 0.005 Moderate 61 PM10
Eunpyung-gu Being Evaluated 32 0.019 0.037 0.9 0.004 - Being Evaluated Being Evaluated
Seodaemun-gu Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated - Being Evaluated Being Evaluated
Mapo-gu 66 32 0.013 0.036 0.6 0.003 Moderate 81 PM10
Yangcheon-gu 45 20 0.013 0.052 0.6 0.003 Moderate 87 NO2
Gangseo-gu 47 20 0.014 0.044 0.5 0.004 Moderate 73 NO2
Guro-gu 54 21 0.017 0.033 0.3 0.004 Moderate 73 PM10
Geumcheon-gu 44 21 0.017 0.037 0.7 0.004 Moderate 62 NO2
Yeongdeungpo-gu 67 34 0.011 0.032 0.6 0.005 Moderate 80 PM10
Dongjak-gu 47 15 0.013 0.040 0.7 0.003 Moderate 67 NO2
Gwanak-gu 54 24 0.012 0.041 0.5 0.004 Moderate 73 PM10
Seocho-gu 68 36 0.006 0.044 0.6 0.003 Moderate 73 NO2
Gangnam-gu 40 17 0.005 0.044 0.6 0.006 Moderate 73 NO2
Songpa-gu 53 22 0.011 0.035 1.0 0.003 Moderate 62 PM10
Gangdong-gu 46 16 0.010 0.033 0.5 0.011 Moderate 62 PM10