Air Quality Information

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Information as of 21 Feb, 2017

◆ 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 0~0.200 0~0.020 0~50
Moderate 16~50 31~80 0.031~0.090 0.031~0.060 2.01~9.00 0.021~0.050 51~100
Unhealthy 51~100 81~150 0.091~0.150 0.061~0.200 9.01~15.00 0.051~0.150 101~250
Very Unhealthy 101~ 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 9 5 0.016 0.016 0.4 0.004 - 33.13 -
Jongno-gu 7 3 0.019 0.018 0.3 0.003 Good 32 O3
Jung-gu 9 7 0.012 0.027 0.4 0.002 Good 46 NO2
Yongsan-gu 11 8 0.019 0.013 0.3 0.003 Good 32 O3
Seongdong-gu 8 4 0.013 0.016 0.5 0.004 Good 27 NO2
Gwangjin-gu 8 3 0.013 0.017 0.4 0.003 Good 29 NO2
Dongdaemun-gu 5 3 0.01 0.019 0.3 0.004 Good 32 NO2
Jungnang-gu 9 7 0.013 0.014 0.3 0.006 Good 24 NO2
Seongbuk-gu Being Evaluated Being Evaluated 0.01 0.026 0.3 0.002 - Being Evaluated Being Evaluated
Gangbuk-gu 5 3 0.016 0.02 0.4 0.003 Good 34 NO2
Dobong-gu 15 6 0.007 0.021 0.4 0.005 Good 36 NO2
Nowon-gu 10 3 0.015 0.018 0.3 0.002 Good 31 NO2
Eunpyung-gu 5 3 0.018 0.015 2.5 0.003 Moderate 55 CO
Seodaemun-gu 11 7 Being Evaluated Being Evaluated Being Evaluated Being Evaluated - Being Evaluated Being Evaluated
Mapo-gu 6 9 0.017 0.013 0.3 0.003 Good 29 O3
Yangcheon-gu 8 5 0.019 0.015 0.2 0.002 Good 32 O3
Gangseo-gu 12 8 0.018 0.019 0.2 0.008 Good 32 NO2
Guro-gu 9 7 0.018 0.014 0.3 0.004 Good 31 O3
Geumcheon-gu 5 5 0.017 0.015 0.2 0.002 Good 29 O3
Yeongdeungpo-gu 18 4 0.022 0.018 0.5 0.002 Good 37 O3
Dongjak-gu 12 4 0.02 0.011 0.2 0.003 Good 34 O3
Gwanak-gu 13 5 0.021 0.012 0.2 0.004 Good 36 O3
Seocho-gu 5 4 0.021 0.007 0.3 0.004 Good 36 O3
Gangnam-gu 8 13 0.014 0.014 0.3 0.004 Good 24 O3
Songpa-gu 5 3 0.019 0.01 0.3 0.004 Good 32 O3
Gangdong-gu 12 3 0.019 0.01 0.2 0.004 Good 32 O3