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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 30 25 0.074 0.01 0.372 0.003 - 86.476 -
Jongno-gu 26 22 0.079 0.009 0.4 0.003 Moderate 91 O3
Jung-gu Being Evaluated 28 0.072 0.009 0.4 0.003 - Being Evaluated Being Evaluated
Yongsan-gu 28 23 0.064 0.010 0.4 0.002 Moderate 79 O3
Seongdong-gu 34 31 0.077 0.010 0.4 0.003 Moderate 90 O3
Gwangjin-gu 25 22 0.080 0.011 0.4 0.003 Moderate 92 O3
Dongdaemun-gu 26 23 0.077 0.011 0.4 0.002 Moderate 90 O3
Jungnang-gu 31 22 0.065 0.011 0.4 0.002 Moderate 80 O3
Seongbuk-gu Being Evaluated 26 0.064 0.017 0.4 0.002 - Being Evaluated Being Evaluated
Gangbuk-gu 37 31 0.068 0.007 0.4 0.002 Moderate 82 O3
Dobong-gu 36 28 0.076 0.013 0.3 0.002 Moderate 89 O3
Nowon-gu 35 28 0.084 0.011 0.4 0.003 Moderate 96 O3
Eunpyung-gu Being Evaluated 25 0.085 0.009 0.2 0.003 - Being Evaluated Being Evaluated
Seodaemun-gu 23 19 0.078 0.010 0.4 0.002 Moderate 91 O3
Mapo-gu 25 24 0.064 0.019 0.4 0.003 Moderate 79 O3
Yangcheon-gu 31 26 0.075 0.009 0.4 0.004 Moderate 88 O3
Gangseo-gu 34 25 0.069 0.009 0.4 0.004 Moderate 83 O3
Guro-gu Being Evaluated 20 0.085 0.007 0.1 0.003 - Being Evaluated Being Evaluated
Geumcheon-gu 32 27 0.068 0.011 0.5 0.003 Moderate 82 O3
Yeongdeungpo-gu 29 26 0.073 0.011 0.4 0.003 Moderate 86 O3
Dongjak-gu 34 27 0.062 0.009 0.4 0.003 Moderate 77 O3
Gwanak-gu 32 24 0.073 0.011 0.5 0.004 Moderate 86 O3
Seocho-gu 24 18 0.082 0.008 0.2 0.003 Moderate 94 O3
Gangnam-gu 34 30 0.080 0.014 0.4 0.003 Moderate 92 O3
Songpa-gu 27 22 0.076 0.007 0.4 0.003 Moderate 89 O3
Gangdong-gu 22 19 0.065 0.008 0.3 0.003 Moderate 80 O3