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Air Quality Information

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◆ Forecast Standards

Category Fine particles(PM-2.5) Coarse Particles(PM-10) Ozone(O₃) Nitrogen Dioxide(NO₂) Carbon Monoxide(CO) Sulfur Dioxide(SO₂) Comprehensive Air Quality Index
Good 0~15 0~30 0~0.030 0~0.030 0~2.00 0~0.020 0~50
Moderate 16~35 31~80 0.031~0.090 0.031~0.060 2.01~9.00 0.021~0.050 51~100
Unhealthy 36~75 81~150 0.091~0.150 0.061~0.200 9.01~15.00 0.051~0.150 101~250
Very Unhealthy 76~ 151~ 0.151~ 0.201~ 15.01~ 0.151~ 251~
Being Evaluated

◆ Alert Standards

Air Pollutant Warning Level Alert Criteria Cancellation Criteria
Ozone Advisory Hourly average of 0.12ppm or higher Hourly average below 0.12ppm
Warning Hourly average of 0.30ppm or higher Hourly average below 0.30ppm
→ Change alert level to advisory
Serious Warning Hourly average of 0.50ppm or higher Hourly average below 0.50ppm
→ Change alert level to warning
Coarse Particles Advisory Hourly average of 150㎍/㎥ or higher for 2 hours or more Hourly average below 100㎍/㎥
Warning Hourly average of 300㎍/㎥ or higher for 2 hours or more Hourly average below 150㎍/㎥
→ Change alert level to advisory
Fine particles Advisory Hourly average of 90㎍/㎥ or higher for 2 hours or more Hourly average below 50㎍/㎥
Warning Hourly average of 180㎍/㎥ or higher for 2 hours or more Hourly average below 90㎍/㎥
→ Change alert level to advisory

◆ Measured Amount of Air Pollutants

Category Station Coarse Particles(㎍/㎥) Fine particles(㎍/㎥) Ozone(ppm) Nitrogen Dioxide(ppm) Carbon Monoxide(ppm) Sulfur Dioxide(ppm) Comprehensive Air Quality Index
1Hour 1Hour 1Hour 1Hour 1Hour 1Hour Level Index Determinant Pollutant
City Air Quality Average for Seoul 39 18 0.013 0.024 0.532 0.003 - 51.857 -
Jongno-gu 33 17 0.019 0.016 0.5 0.003 Moderate 51 PM25
Jung-gu 30 17 0.016 0.021 0.5 0.003 Moderate 51 PM25
Yongsan-gu 27 17 0.013 0.027 0.5 0.003 Good 46 PM25
Seongdong-gu 44 18 0.019 0.027 0.5 0.002 Good 46 PM25
Gwangjin-gu 36 21 0.002 0.028 0.8 0.003 Moderate 53 PM25
Dongdaemun-gu Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated - Being Evaluated Being Evaluated
Jungnang-gu Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated - Being Evaluated Being Evaluated
Seongbuk-gu 50 18 0.011 0.028 0.6 0.002 Moderate 57 PM10
Gangbuk-gu 34 16 0.012 0.026 0.6 0.002 Good 47 PM10
Dobong-gu 30 14 0.007 0.023 0.6 0.003 Good 39 NO2
Nowon-gu 27 18 0.003 0.021 0.6 0.004 Moderate 52 PM25
Eunpyung-gu 40 21 0.021 0.016 0.5 0.004 Good 49 PM25
Seodaemun-gu 45 16 0.019 0.014 0.7 0.004 Good 49 PM10
Mapo-gu Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated - Being Evaluated Being Evaluated
Yangcheon-gu 53 24 0.019 0.022 0.5 0.004 Moderate 64 PM10
Gangseo-gu 56 23 0.018 0.017 0.5 0.003 Moderate 63 PM10
Guro-gu 39 18 0.021 0.023 0.4 0.004 Moderate 51 PM10
Geumcheon-gu 39 21 0.016 0.030 0.5 0.003 Moderate 52 PM25
Yeongdeungpo-gu 42 24 0.008 0.030 0.4 0.002 Moderate 53 PM25
Dongjak-gu 46 20 0.016 0.024 0.5 0.003 Moderate 53 PM25
Gwanak-gu Being Evaluated Being Evaluated 0.004 0.024 0.5 0.003 - Being Evaluated Being Evaluated
Seocho-gu 40 15 0.017 0.026 0.4 0.003 Good 44 PM10
Gangnam-gu 39 14 0.018 0.023 0.4 0.003 Moderate 51 PM10
Songpa-gu 30 14 0.007 0.036 0.6 0.003 Moderate 60 NO2
Gangdong-gu 31 14 0.003 0.035 0.6 0.002 Moderate 58 NO2