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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 33 21 0.035 0.013 0.433 0.004 - 53.318 -
Jongno-gu 35 19 0.029 0.018 0.4 0.003 Good 49 O3
Jung-gu 30 19 0.032 0.017 0.4 0.003 Moderate 52 O3
Yongsan-gu 31 26 0.037 0.016 0.4 0.003 Moderate 56 O3
Seongdong-gu 32 16 0.038 0.015 0.4 0.003 Moderate 57 O3
Gwangjin-gu 30 21 0.030 0.013 0.7 0.005 - Being Evaluated Being Evaluated
Dongdaemun-gu Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated Being Evaluated - Being Evaluated Being Evaluated
Jungnang-gu 30 20 0.030 0.013 0.3 0.006 Moderate 51 O3
Seongbuk-gu 20 16 0.032 0.018 0.6 0.003 Moderate 52 O3
Gangbuk-gu 47 27 0.035 0.014 0.4 0.003 Moderate 55 O3
Dobong-gu 35 16 0.039 0.007 0.5 0.004 Moderate 58 O3
Nowon-gu 34 20 0.028 0.016 0.4 0.004 Good 47 O3
Eunpyung-gu 39 24 0.041 0.014 0.2 0.005 Moderate 60 O3
Seodaemun-gu 32 18 0.043 0.008 0.6 0.004 Moderate 61 O3
Mapo-gu 33 19 0.026 0.011 0.8 0.004 Good 44 O3
Yangcheon-gu 36 22 0.032 0.012 0.4 0.004 Moderate 52 O3
Gangseo-gu 33 26 0.046 0.009 0.3 0.003 Moderate 64 O3
Guro-gu Being Evaluated 21 0.053 0.008 0.3 0.005 - Being Evaluated Being Evaluated
Geumcheon-gu 33 21 0.029 0.016 0.6 0.005 Good 49 O3
Yeongdeungpo-gu 38 26 0.032 0.017 0.4 0.002 Moderate 52 O3
Dongjak-gu 38 24 0.031 0.012 0.4 0.004 Moderate 52 PM25
Gwanak-gu 35 16 0.050 0.013 0.3 0.005 Moderate 67 O3
Seocho-gu 31 23 0.032 0.012 0.4 0.004 Moderate 52 O3
Gangnam-gu 36 21 0.028 0.009 0.4 0.005 Good 47 O3
Songpa-gu 28 16 0.033 0.013 0.3 0.004 Moderate 53 O3
Gangdong-gu 32 20 0.022 0.013 0.5 0.003 Good 43 PM25