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Air Quality Information


◆ 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 45 25 0.003 0.056 1 0.005 - 92.36 -
Jongno-gu 35 20 0.002 0.064 1.0 0.004 Unhealthy 105 NO2
Jung-gu 34 22 0.002 0.048 0.8 0.004 Moderate 80 NO2
Yongsan-gu 40 30 0.001 0.063 1.1 0.004 Unhealthy 104 NO2
Seongdong-gu 49 25 0.002 0.061 0.8 0.006 Unhealthy 101 NO2
Gwangjin-gu 51 24 0.001 0.057 Being Evaluated 0.004 Moderate 95 NO2
Dongdaemun-gu 51 34 0.003 0.079 1.4 0.008 Unhealthy 121 NO2
Jungnang-gu 37 19 0.003 0.043 0.7 0.007 Moderate 72 NO2
Seongbuk-gu 42 24 0.002 0.062 0.8 0.005 Unhealthy 103 NO2
Gangbuk-gu 27 17 0.011 0.028 0.7 0.003 Moderate 53 PM25
Dobong-gu 43 28 0.003 0.045 1.1 0.005 Moderate 75 NO2
Nowon-gu 37 22 0.002 0.054 0.9 0.008 Moderate 90 NO2
Eunpyung-gu 26 17 0.004 0.042 0.8 0.004 Moderate 70 NO2
Seodaemun-gu 30 24 0.004 0.042 1.4 0.012 Moderate 70 NO2
Mapo-gu 54 28 0.002 0.052 1.0 0.004 Moderate 87 NO2
Yangcheon-gu 42 22 0.003 0.052 0.7 0.003 Moderate 87 NO2
Gangseo-gu 50 21 0.002 0.051 0.9 0.011 Moderate 85 NO2
Guro-gu 33 23 0.001 0.052 0.5 0.005 Moderate 87 NO2
Geumcheon-gu 44 33 0.001 0.067 1.0 0.004 Unhealthy 108 NO2
Yeongdeungpo-gu 44 21 0.022 0.032 1.0 0.005 Moderate 66 PM10
Dongjak-gu 52 23 0.002 0.086 1.2 0.004 Unhealthy 128 NO2
Gwanak-gu 68 45 0.004 0.096 1.6 0.005 Unhealthy 139 NO2
Seocho-gu 44 19 0.002 0.037 1.1 0.005 Moderate 65 PM10
Gangnam-gu 47 22 0.003 0.055 1.1 0.005 Moderate 92 NO2
Songpa-gu 79 42 0.002 0.078 1.3 0.005 Unhealthy 120 NO2
Gangdong-gu 61 30 0.002 0.065 1.1 0.006 Unhealthy 106 NO2