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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 13 5 0.013 0.021 0.352 0.003 - 36.789 -
Jongno-gu Being Evaluated 7 0.018 0.018 0.4 0.003 - Being Evaluated Being Evaluated
Jung-gu 17 3 Being Evaluated Being Evaluated Being Evaluated Being Evaluated - Being Evaluated Being Evaluated
Yongsan-gu 10 3 0.016 0.011 0.3 0.003 Good 27 O3
Seongdong-gu 13 6 0.013 0.028 0.3 0.005 Good 47 NO2
Gwangjin-gu 15 9 0.013 0.013 0.5 0.003 Good 22 O3
Dongdaemun-gu 6 3 0.016 0.019 0.4 0.003 Good 32 NO2
Jungnang-gu 17 9 0.013 0.021 0.4 0.002 Good 36 PM25
Seongbuk-gu 12 5 0.017 0.019 0.3 0.003 Good 32 NO2
Gangbuk-gu 11 3 0.019 0.014 0.4 Being Evaluated Good 32 O3
Dobong-gu 5 3 0.017 0.013 0.3 0.003 Good 29 O3
Nowon-gu 8 3 0.020 0.015 0.4 0.002 Good 34 O3
Eunpyung-gu 16 5 0.014 0.018 0.1 0.003 Good 31 NO2
Seodaemun-gu 12 4 0.012 0.018 0.3 0.003 Good 31 NO2
Mapo-gu 14 5 0.008 0.025 0.4 0.002 Good 42 NO2
Yangcheon-gu 12 4 0.012 0.021 0.3 0.002 Good 36 NO2
Gangseo-gu 12 6 0.013 0.021 0.3 0.003 Good 36 NO2
Guro-gu Being Evaluated Being Evaluated 0.012 0.012 0.3 0.002 - Being Evaluated Being Evaluated
Geumcheon-gu 11 4 0.009 0.026 0.4 0.002 Good 44 NO2
Yeongdeungpo-gu 17 5 0.008 0.024 0.4 0.003 Good 41 NO2
Dongjak-gu Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated - Being Evaluated Being Evaluated
Gwanak-gu 15 4 0.007 0.033 0.4 0.002 Moderate 55 NO2
Seocho-gu 12 1 0.010 0.033 0.4 0.003 Moderate 55 NO2
Gangnam-gu 11 6 0.012 0.022 0.4 0.003 Good 37 NO2
Songpa-gu 26 Being Evaluated 0.011 0.026 0.4 0.003 - Being Evaluated Being Evaluated
Gangdong-gu 21 Being Evaluated 0.010 0.023 0.3 0.002 - Being Evaluated Being Evaluated