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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 24 11 0.031 0.019 0.336 0.003 - 57.792 -
Jongno-gu 19 10 0.033 0.020 0.4 0.003 Moderate 53 O3
Jung-gu 19 9 0.029 0.029 0.4 0.002 Good 49 PM25
Yongsan-gu 14 8 0.035 0.017 0.3 0.003 Moderate 55 O3
Seongdong-gu 30 9 0.042 0.016 0.3 0.003 Moderate 61 O3
Gwangjin-gu 27 17 0.031 0.019 0.5 0.003 Moderate 56 PM25
Dongdaemun-gu 16 8 0.038 0.020 0.3 0.004 Moderate 57 O3
Jungnang-gu 19 12 0.036 0.011 0.2 0.005 Moderate 56 O3
Seongbuk-gu 24 7 0.027 0.031 0.7 0.002 Moderate 51 PM25
Gangbuk-gu 25 9 0.035 0.017 0.3 0.002 Moderate 55 O3
Dobong-gu 27 9 0.040 0.011 0.3 0.003 Moderate 59 O3
Nowon-gu 23 11 0.035 0.010 0.3 0.003 Moderate 55 PM25
Eunpyung-gu 34 13 0.038 0.015 0.4 0.004 Moderate 57 O3
Seodaemun-gu 32 14 0.039 0.013 0.5 0.003 Moderate 58 O3
Mapo-gu 32 14 0.028 0.016 0.3 0.004 Moderate 62 PM10
Yangcheon-gu 22 10 0.026 0.022 0.4 0.003 Moderate 58 PM25
Gangseo-gu 21 10 0.030 0.026 0.4 0.003 Moderate 56 PM25
Guro-gu 24 13 0.027 0.018 0.2 0.004 Moderate 66 PM25
Geumcheon-gu 24 17 0.021 0.026 0.4 0.003 Moderate 61 PM25
Yeongdeungpo-gu 30 11 0.026 0.013 0.2 0.003 Moderate 69 PM10
Dongjak-gu 27 11 0.028 0.027 0.4 0.003 Moderate 61 PM25
Gwanak-gu 23 12 0.026 0.024 0.2 0.005 Moderate 66 PM25
Seocho-gu 24 16 0.033 0.016 0.2 0.004 Moderate 62 PM25
Gangnam-gu 16 9 0.023 0.020 0.2 0.006 Moderate 52 PM25
Songpa-gu 22 Being Evaluated 0.027 0.024 0.3 0.002 - Being Evaluated Being Evaluated
Gangdong-gu 19 10 0.031 0.014 0.3 0.004 Moderate 52 PM25